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Installation Ubuntu à coté de Windows 10

Broot

Bonjour,

Je suis en train d'installer Ubuntu pour avoir un Dualboot avec Windows sur mon ordinateur.
Ma clé bootable fonctionne et Ubuntu est installé sur ses partitions (racine sur mon SDD et dossier /home sur mon HDD).
Le problème est que j'arrive pas à accéder au grub afin de pouvoir choisir entre aller sur ubuntu ou sur windows (actuellement mon ordi va directement sur windows).

Je suis déjà aller dans mon BIOS et j'ai l'impression qu'il ne détecte pas qu'il y a Ubuntu. Je vois le "Windows Boot Manager" mais rien d'équivalent pour le Grub ou Ubuntu.

Voici mon boot-info : https://paste.ubuntu.com/p/dyzjSVyyJp/.
Sda est mon hdd, sdb ma clé bootable et sdc mon ssd.
Vous pouvez ainsi voir que mon ordinateur reconnait les 2 OS et que Grub est installé.

J'ai meme essayé de modifier le chemin vers le windows Boot Manager vers Grub (grâce à bcdedit), mais cela ne fonctionne toujours pas.

Pouvez-vous m'expliquer ce que je dois faire afin de corriger cette erreur?

Merci d'avance

Kabak_85

Jette un oeil sur l'ordre de démarrage :

BootOrder: 2001,0002,0000,2002,2003

L'ordre de démarrage donne donc :

Boot2001* EFI USB Device	RC
Boot0002* Windows Boot Manager	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}....................
Boot0000* Linux	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\Boot\grubx64.efi)RC
Boot2002* EFI DVD/CDROM	RC
Boot2003* EFI Network	RC

Si le bios n'identifie rien sur le périphérique USB, il lance le "Windows Boot Manager" avant d'essayer de lancer "Grub".

ikewdu

Salut,

Une situation fréquente sur les PC Acer.

Boot0001* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC

Peux-tu déjà donner le modèle exact STP ?

Ensuite, la procédure qui fonctionne généralement sur les Acer est celle de Gesbuklu : https://forum.ubuntu-fr.org/viewtopic.php?pid=21468818#p21468818

J'ai l'impression que tu as tenté quelque chose de ce genre avec l'entrée "Linux" qui n'est pas habituelle.. Mais ~~avec le secure-boot activé (ton cas)~~, il faut qu'elle cible le fichier shimx64.efi avec le secure-boot activé, et non grubx64.efi .Tu as trois cibles possibles pour ce même fichier :

78415fb8fb9b909f8029858113f1335f   sdc1/Boot/bkpbootx64.efi
78415fb8fb9b909f8029858113f1335f   sdc1/Boot/bootx64.efi
78415fb8fb9b909f8029858113f1335f   sdc1/ubuntu/shimx64.efi

Essaie avec le troisième, puis si besoin, avec le second (le premier étant une trace du passage par boot-repair que tu as dû tenter plusieurs fois)... Et remets ton démarrage de Windows en état avec bcdedit, si ce n'est déjà fait.

malbo

Bonjour,
Je colle ci-dessous le contenu du Boot-info dont tu as donné le lien ( https://paste.ubuntu.com/p/dyzjSVyyJp/ ) dans le post #1 :

boot-info-4ppa125                                              [20201207_2300]

============================== Boot Info Summary ===============================

 => No boot loader is installed in the MBR of /dev/sda.
 => No known boot loader is installed in the MBR of /dev/sdb.
 => Grub2 (v2.00) is installed in the MBR of /dev/sdc and looks at sector 
    250062848 of the same hard drive for core.img. core.img is at this 
    location and looks for (,gpt5)/boot/grub. It also embeds following 
    components:
    
    modules
    ---------------------------------------------------------------------------
    fshelp ext2 part_gpt biosdisk
    ---------------------------------------------------------------------------

sda1: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows 8/2012: NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        /boot/grub/i386-pc/core.img

sda2: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info: 
    Operating System:  
    Boot files:        

sdb1: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows 8/2012: NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        /boot/grub/grub.cfg /syslinux.cfg

sdb2: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  FAT16
    Boot sector info:  According to the info in the boot sector, sdb2 starts 
                       at sector 0. But according to the info from fdisk, 
                       sdb2 starts at sector 247199621. According to the info 
                       in the boot sector, sdb2 has 0 sectors.
    Operating System:  
    Boot files:        /efi/Boot/bootaa64.efi /efi/Boot/bootarm.efi 
                       /efi/Boot/bootia32.efi /efi/Boot/bootx64.efi 
                       /efi/Rufus/exfat_aa64.efi /efi/Rufus/exfat_arm.efi 
                       /efi/Rufus/exfat_ia32.efi /efi/Rufus/exfat_x64.efi 
                       /efi/Rufus/ntfs_aa64.efi /efi/Rufus/ntfs_arm.efi 
                       /efi/Rufus/ntfs_ia32.efi /efi/Rufus/ntfs_x64.efi

sdc1: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  Windows 8/2012: FAT32
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        /efi/Boot/bkpbootx64.efi /efi/Boot/bootx64.efi 
                       /efi/Boot/fbx64.efi /efi/Boot/grubx64.efi 
                       /efi/Boot/mmx64.efi /efi/ubuntu/grubx64.efi 
                       /efi/ubuntu/mmx64.efi /efi/ubuntu/shimx64.efi 
                       /efi/ubuntu/grub.cfg /efi/Microsoft/Boot/bootmgfw.efi 
                       /efi/Microsoft/Boot/bootmgr.efi 
                       /efi/Microsoft/Boot/memtest.efi 
                       /efi/OEM/Boot/bootmgfw.efi /efi/OEM/Boot/bootmgr.efi 
                       /efi/OEM/Boot/memtest.efi

sdc2: __________________________________________________________________________

    File system:       
    Boot sector type:  -
    Boot sector info: 

sdc3: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows 8/2012: NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  Windows 10
    Boot files:        /bootmgr /Windows/System32/winload.exe

sdc4: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows 8/2012: NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        

sdc5: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info: 
    Operating System:  Ubuntu 20.04.1 LTS
    Boot files:        /boot/grub/grub.cfg /etc/fstab /etc/default/grub

sdc6: __________________________________________________________________________

    File system:       BIOS Boot partition
    Boot sector type:  Grub2's core.img
    Boot sector info: 


================================ 2 OS detected =================================

OS#1:   Ubuntu 20.04.1 LTS on sdc5
OS#2:   Windows 10 on sdc3

============================ Architecture/Host Info ============================

CPU architecture: 64-bit
Live-session OS is Ubuntu 64-bit (Ubuntu 20.04.1 LTS, focal, x86_64)


===================================== UEFI =====================================

BIOS is EFI-compatible, and is setup in EFI-mode for this live-session.
SecureBoot disabled.

efibootmgr -v
BootCurrent: 0003
Timeout: 0 seconds
BootOrder: 2001,0002,0000,2002,2003
Boot0000* Linux	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\Boot\grubx64.efi)RC
Boot0001* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0002* Windows Boot Manager	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}....................
Boot0003* USB HDD: USB DISK 3.0	PciRoot(0x0)/Pci(0x14,0x0)/USB(3,0)/HD(2,GPT,d77f5ab3-e344-423e-bbeb-3c646231a6d7,0xebbf785,0x400)RC
Boot0004* ubuntu	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)
Boot2001* EFI USB Device	RC
Boot2002* EFI DVD/CDROM	RC
Boot2003* EFI Network	RC

d7708f458bebe1ddc4dbfb0c84e836e2   sdb2/Boot/bootaa64.efi
3e7a76f257fda2e95d31a93d9daeea6e   sdb2/Boot/bootarm.efi
005d0e74f985332cdcdf4a48e80d998c   sdb2/Boot/bootia32.efi
b19dc8b2f70d1ec75f028c62501f2e56   sdb2/Boot/bootx64.efi
483174f03b10cea126b96b5ff384a2ea   sdb2/Rufus/exfat_aa64.efi
31f4f38fd1df24563f630086876c1e2c   sdb2/Rufus/exfat_arm.efi
311153f906b4915c2ce0eddfef1dbf83   sdb2/Rufus/exfat_ia32.efi
ac67ad1ffbe41329b0146bb1515f8c7c   sdb2/Rufus/exfat_x64.efi
f6bf7dfbca86dee858c93d9891c558da   sdb2/Rufus/ntfs_aa64.efi
d608f86ca32dac77da9ea5bc2c7f4361   sdb2/Rufus/ntfs_arm.efi
0bdb23923abec3002ca08490be64dfe2   sdb2/Rufus/ntfs_ia32.efi
9d5376da83f24a88e5b53131a36b79e0   sdb2/Rufus/ntfs_x64.efi
78415fb8fb9b909f8029858113f1335f   sdc1/Boot/bkpbootx64.efi
78415fb8fb9b909f8029858113f1335f   sdc1/Boot/bootx64.efi
2895d47544fd587b26c7e29be1295c27   sdc1/Boot/fbx64.efi
8ed07d5ee4e5e1534bcf64037b7589ff   sdc1/Boot/grubx64.efi
dc3c47be2f78a78e5e57d097ae6c5c84   sdc1/Boot/mmx64.efi
8ed07d5ee4e5e1534bcf64037b7589ff   sdc1/ubuntu/grubx64.efi
dc3c47be2f78a78e5e57d097ae6c5c84   sdc1/ubuntu/mmx64.efi
78415fb8fb9b909f8029858113f1335f   sdc1/ubuntu/shimx64.efi
e69be5ddc7c4165e0f3e5ee05d267ec2   sdc1/Microsoft/Boot/bootmgfw.efi
5a0ceb06ab09d5c2be36b38bcb33617f   sdc1/Microsoft/Boot/bootmgr.efi
63d035caf33c9fb1533165ddd38dacbc   sdc1/OEM/Boot/bootmgfw.efi
6c6caf61867647ffe470e6121e3c68dd   sdc1/OEM/Boot/bootmgr.efi


============================= Drive/Partition Info =============================

Disks info: ____________________________________________________________________

sda	: is-GPT,	no-BIOSboot,	has-noESP, 	not-usb,	not-mmc, no-os,	2048 sectors * 512 bytes
sdb	: is-GPT,	no-BIOSboot,	has-noESP, 	usb-disk,	not-mmc, no-os,	2048 sectors * 512 bytes
sdc	: is-GPT,	hasBIOSboot,	has---ESP, 	not-usb,	not-mmc, has-os,	2048 sectors * 512 bytes

Partitions info (1/3): _________________________________________________________

sda1	: no-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	farbios
sda2	: no-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	farbios
sdb2	: no-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	farbios
sdc1	: no-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	not-far
sdc3	: is-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	not-far
sdc4	: no-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	farbios
sdc5	: is-os,	64, apt-get,	signed grub-pc grub-efi ,	grub2,	grub-install,	grubenv-ok,	update-grub,	farbios

Partitions info (2/3): _________________________________________________________

sda1	: isnotESP,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot
sda2	: isnotESP,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot
sdb2	: isnotESP,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot
sdc1	: is---ESP,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot
sdc3	: isnotESP,	part-has-no-fstab,	no-nt,	haswinload,	no-recov-nor-hid,	bootmgr,	notwinboot
sdc4	: isnotESP,	part-has-no-fstab,	no-nt,	no-winload,	recovery-or-hidden,	no-bmgr,	notwinboot
sdc5	: isnotESP,	fstab-has-goodEFI,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot

Partitions info (3/3): _________________________________________________________

sda1	: not-sepboot,	no-kernel,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sda
sda2	: maybesepboot,	no-boot,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sda
sdb2	: not-sepboot,	no-boot,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sdb
sdc1	: not-sepboot,	no-boot,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sdc
sdc3	: not-sepboot,	no-boot,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sdc
sdc4	: not-sepboot,	no-boot,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sdc
sdc5	: not-sepboot,	with-boot,	fstab-without-boot,	not-sep-usr,	with--usr,	fstab-without-usr,	std-grub.d,	sdc

fdisk -l (filtered): ___________________________________________________________

Disk sda: 465.78 GiB, 500107862016 bytes, 976773168 sectors
Disk identifier: 6709357D-8D86-4E98-B91B-1F85C7CFAC26
          Start       End   Sectors   Size Type
sda1       2048 464773119 464771072 221.6G Microsoft basic data
sda2  464773120 976771166 511998047 244.1G Linux filesystem
Disk sdb: 117.9 GiB, 126567317504 bytes, 247201792 sectors
Disk identifier: D53A43A3-4E82-4111-A50C-0E8CDE39F3F0
          Start       End   Sectors   Size Type
sdb1       2048 247199620 247197573 117.9G Microsoft basic data
sdb2  247199621 247200644      1024   512K Microsoft basic data
Disk sdc: 119.25 GiB, 128035676160 bytes, 250069680 sectors
Disk identifier: 805DB973-7673-4600-A157-489ABCF0C0CE
          Start       End   Sectors    Size Type
sdc1       2048    206847    204800    100M EFI System
sdc2     206848    239615     32768     16M Microsoft reserved
sdc3     239616 193582546 193342931   92.2G Microsoft basic data
sdc4  247971840 250061683   2089844 1020.4M Windows recovery environment
sdc5  193583104 247969822  54386719     26G Linux filesystem
sdc6  250062848 250068991      6144      3M BIOS boot
Partition table entries are not in disk order.

parted -lm (filtered): _________________________________________________________

sda:500GB:scsi:512:4096:gpt:ATA TOSHIBA MQ01ABF0:;
1:1049kB:238GB:238GB:ntfs:Windows:msftdata;
2:238GB:500GB:262GB:ext4::;
sdb:127GB:scsi:512:512:gpt: USB DISK 3.0:;
1:1049kB:127GB:127GB:ntfs:Main Data Partition:msftdata;
2:127GB:127GB:524kB::UEFI:NTFS:msftdata;
sdc:128GB:scsi:512:512:gpt:ATA KINGSTON RBUSNS8:;
1:1049kB:106MB:105MB:fat32:EFI system partition:boot, esp;
2:106MB:123MB:16.8MB::Microsoft reserved partition:msftres;
3:123MB:99.1GB:99.0GB:ntfs:Basic data partition:msftdata;
5:99.1GB:127GB:27.8GB:ext4::;
4:127GB:128GB:1070MB:ntfs::hidden, diag;
6:128GB:128GB:3146kB:::bios_grub;

blkid (filtered): ______________________________________________________________

NAME   FSTYPE   UUID                                 PARTUUID                             LABEL                    PARTLABEL
sda                                                                                                                
â”œâ”€sda1 ntfs     3C0C1CE30C1C9A4A                     db592755-a635-4630-aa77-31ae92b3a58c Data                     Windows
â””â”€sda2 ext4     34c985d5-5a9f-444a-90f5-ae476ada0395 dde8d2fb-6787-4da3-b371-c195fd5032ff                          
sdb                                                                                                                
â”œâ”€sdb1 ntfs     98F83C6DF83C4C2E                     a5322869-c643-43a8-b7f4-efbc62e4ee5a Ubuntu 20_04_1 LTS amd64 Main Data Partition
â””â”€sdb2 vfat     1DB0-EF13                            d77f5ab3-e344-423e-bbeb-3c646231a6d7 UEFI_NTFS                UEFI:NTFS
sdc                                                                                                                
â”œâ”€sdc1 vfat     B410-0716                            a3842291-4a30-40a7-b9ed-a1a68ac8d87a ESP                      EFI system partition
â”œâ”€sdc2                                               2932984c-405f-4be2-b4c7-881c77bee7bb                          Microsoft reserved partition
â”œâ”€sdc3 ntfs     9668179668177469                     fa43381e-c876-47a3-812a-236b90839744 Acer                     Basic data partition
â”œâ”€sdc4 ntfs     0A3E18703E185753                     889f7e74-a8d4-4a3d-bbfb-492c7182a433 Recovery                 Basic data partition
â”œâ”€sdc5 ext4     c93c55b7-7ddf-4dd3-99f4-3fc88164e52b be94e480-d0ff-493a-9358-09276b5aadf9                          
â””â”€sdc6                                               716c87f7-4c04-4b41-9ac4-b450a25b9818                          

df (filtered): _________________________________________________________________

       Avail Use% Mounted on
sda1   162.9G  26% /mnt/boot-sav/sda1
sda2     227G   0% /mnt/boot-sav/sda2
sdb1   115.2G   2% /cdrom
sdb2      22K  96% /mnt/boot-sav/sdb2
sdc1    36.5M  62% /mnt/boot-sav/sdc1
sdc3     7.7G  92% /mnt/boot-sav/sdc3
sdc4   528.2M  48% /mnt/boot-sav/sdc4
sdc5    17.3G  27% /mnt/boot-sav/sdc5

Mount options: __________________________________________________________________

sda1   rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
sda2   rw,relatime
sdb1   rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
sdb2   rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro
sdc1   rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro
sdc3   rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
sdc4   rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
sdc5   rw,relatime

==================== sda1: Location of files loaded by Grub ====================

           GiB - GB             File                                 Fragment(s)
            ?? = ??             boot/grub/i386-pc/core.img                     1

====================== sdb1/boot/grub/grub.cfg (filtered) ======================

Ubuntu
Ubuntu (safe graphics)
OEM install (for manufacturers)
Boot from next volume
UEFI Firmware Settings

========================= sdb1/syslinux.cfg (filtered) =========================

DEFAULT loadconfig

LABEL loadconfig
  CONFIG /isolinux/isolinux.cfg
  APPEND /isolinux/

==================== sdb1: Location of files loaded by Grub ====================

           GiB - GB             File                                 Fragment(s)
            ?? = ??             boot/grub/grub.cfg                             1

================== sdb1: Location of files loaded by Syslinux ==================

           GiB - GB             File                                 Fragment(s)
            ?? = ??             syslinux.cfg

===================== sdc1/efi/ubuntu/grub.cfg (filtered) ======================

search.fs_uuid c93c55b7-7ddf-4dd3-99f4-3fc88164e52b root hd2,gpt5 
set prefix=($root)'/boot/grub'
configfile $prefix/grub.cfg

====================== sdc5/boot/grub/grub.cfg (filtered) ======================

Ubuntu   c93c55b7-7ddf-4dd3-99f4-3fc88164e52b
Ubuntu, with Linux 5.4.0-56-generic   c93c55b7-7ddf-4dd3-99f4-3fc88164e52b
Ubuntu, with Linux 5.4.0-42-generic   c93c55b7-7ddf-4dd3-99f4-3fc88164e52b
Windows Boot Manager (on sdc1)   osprober-efi-B410-0716
### END /etc/grub.d/30_os-prober ###
UEFI Firmware Settings   uefi-firmware
### END /etc/grub.d/30_uefi-firmware ###

========================== sdc5/etc/fstab (filtered) ===========================

# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sdc5 during installation
UUID=c93c55b7-7ddf-4dd3-99f4-3fc88164e52b /               ext4    errors=remount-ro 0       1
# /boot/efi was on /dev/sdc1 during installation
# /home was on /dev/sda2 during installation
UUID=34c985d5-5a9f-444a-90f5-ae476ada0395 /home           ext4    defaults        0       2
/swapfile                                 none            swap    sw              0       0
UUID=B410-0716  /boot/efi       vfat    defaults      0       1

======================= sdc5/etc/default/grub (filtered) =======================

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

==================== sdc5: Location of files loaded by Grub ====================

           GiB - GB             File                                 Fragment(s)
 102.539051056 = 110.100467712  boot/grub/grub.cfg                             1
  97.662246704 = 104.864038912  boot/vmlinuz                                   1
  96.359493256 = 103.465218048  boot/vmlinuz-5.4.0-42-generic                  2
  97.662246704 = 104.864038912  boot/vmlinuz-5.4.0-56-generic                  1
  96.359493256 = 103.465218048  boot/vmlinuz.old                               2
  97.970966339 = 105.195524096  boot/initrd.img                                2
  97.064662933 = 104.222388224  boot/initrd.img-5.4.0-42-generic               3
  97.970966339 = 105.195524096  boot/initrd.img-5.4.0-56-generic               2
  97.064662933 = 104.222388224  boot/initrd.img.old                            3

===================== sdc5: ls -l /etc/grub.d/ (filtered) ======================

-rwxr-xr-x 1 root root 17622 Nov 12 23:15 10_linux
-rwxr-xr-x 1 root root 42359 Nov 12 23:15 10_linux_zfs
-rwxr-xr-x 1 root root 12894 Jul 31 00:34 20_linux_xen
-rwxr-xr-x 1 root root 12059 Jul 31 00:34 30_os-prober
-rwxr-xr-x 1 root root  1424 Jul 31 00:34 30_uefi-firmware
-rwxr-xr-x 1 root root   214 Jul 31 00:34 40_custom
-rwxr-xr-x 1 root root   216 Jul 31 00:34 41_custom


======================== Unknown MBRs/Boot Sectors/etc =========================

Unknown MBR on /dev/sdb

00000000  41 4b 45 4f fc 31 c0 fa  8e d0 bc 00 7c fb 8e d8  |AKEO.1......|...|
00000010  bb 13 04 8b 07 83 e8 04  89 07 c1 e0 06 8e c0 b7  |................|
00000020  07 b8 7f 00 cd 10 31 db  31 c9 ba 4f 18 b8 00 06  |......1.1..O....|
00000030  cd 10 31 d2 b4 02 cd 10  b4 41 bb aa 55 cd 13 72  |..1......A..U..r|
00000040  27 81 fb 55 aa 75 21 f7  c1 01 00 74 1b 66 31 c0  |'..U.u!....t.f1.|
00000050  66 50 6a 22 06 66 50 6a  08 6a 10 89 e6 b4 42 cd  |fPj".fPj.j....B.|
00000060  13 9f 83 c4 10 9e eb 0d  b8 08 02 b9 23 00 ba 80  |............#...|
00000070  00 31 db cd 13 bb 07 00  72 0b 31 f6 8c c0 8e d8  |.1......r.1.....|
00000080  e8 3f 00 eb 06 be 17 7d  e8 37 00 31 c0 8e d8 be  |.?.....}.7.1....|
00000090  63 7d e8 2d 00 e8 1d 00  b4 01 cd 16 75 08 b4 02  |c}.-........u...|
000000a0  cd 16 24 04 74 f2 31 c0  8e d8 b8 34 12 a3 73 04  |..$.t.1....4..s.|
000000b0  ea 00 00 ff ff b4 01 cd  16 74 06 b4 00 cd 16 e2  |.........t......|
000000c0  f4 c3 ac 3c 00 74 4f 3c  0d 74 f7 3c 0a 75 10 53  |...<.tO<.t.<.u.S|
000000d0  b4 03 cd 10 fe c6 b2 00  b4 02 cd 10 5b eb e3 3c  |............[..<|
000000e0  5c 75 1c b1 02 ac 3c 46  7f d8 2c 30 3c 09 7e 02  |\u....<F..,0<.~.|
000000f0  2c 07 c0 e3 04 24 0f 08  c3 fe c9 75 e8 eb c3 b9  |,....$.....u....|
00000100  01 00 b4 09 cd 10 53 31  db b4 03 cd 10 fe c2 b4  |......S1........|
00000110  02 cd 10 5b eb ac c3 0d  0a 20 20 20 20 20 20 20  |...[.....       |
00000120  20 20 20 20 20 20 5c 30  34 2a 2a 2a 20 45 52 52  |      \04*** ERR|
00000130  4f 52 3a 20 54 48 49 53  20 4d 45 44 49 41 20 43  |OR: THIS MEDIA C|
00000140  41 4e 4e 4f 54 20 42 4f  4f 54 20 49 4e 20 4c 45  |ANNOT BOOT IN LE|
00000150  47 41 43 59 20 4d 4f 44  45 20 2a 2a 2a 5c 30 37  |GACY MODE ***\07|
00000160  0d 0a 00 0d 0a 0d 0a 20  20 20 20 20 20 20 20 20  |.......         |
00000170  20 20 20 20 5c 37 30 50  6c 65 61 73 65 20 72 65  |    \70Please re|
00000180  6d 6f 76 65 20 74 68 69  73 20 6d 65 64 69 61 20  |move this media |
00000190  61 6e 64 20 70 72 65 73  73 20 61 6e 79 20 6b 65  |and press any ke|
000001a0  79 20 74 6f 20 72 65 62  6f 6f 74 5c 30 37 00 00  |y to reboot\07..|
000001b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001c0  02 00 ee fe 3f 1a 01 00  00 00 ff ff ff ff 00 00  |....?...........|
000001d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001e0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa  |..............U.|
00000200


=============================== StdErr Messages ================================

File descriptor 63 (pipe:[98669]) leaked on lvs invocation. Parent PID 7747: /bin/bash

Suggested repair: ______________________________________________________________

The default repair of the Boot-Repair utility would reinstall the grub-efi-amd64-signed of
sdc5,
using the following options:        sdc1/boot/efi,
Additional repair would be performed: unhide-bootmenu-10s win-legacy-basic-fix use-standard-efi-file  restore-efi-backups  

Final advice in case of suggested repair: ______________________________________


Please do not forget to make your UEFI firmware boot on the Ubuntu 20.04.1 LTS entry (sdc1/efi/****/shim****.efi (**** will be updated in the final message) file) !
If your computer reboots directly into Windows, try to change the boot order in your UEFI firmware.

If your UEFI firmware does not allow to change the boot order, change the default boot entry of the Windows bootloader.
For example you can boot into Windows, then type the following command in an admin command prompt:
bcdedit /set {bootmgr} path \EFI\****\shim****.efi (**** will be updated in the final message)

On y voit cette ligne :

SecureBoot disabled.

Ce qui signifie que tu as désactivé secure Boot. Mais si j'en crois ce post, pour que tu puisses sélectionner "Select an UEFI file as trusted", il va falloir que tu réactives Secure Boot.

ikewdu

Salut malbo,

En effet, j'ai modifié mon message....

Broot

Bonjour tout d'abord merci pour vos messages.

ikewdu a écrit Peux-tu déjà donner le modèle exact STP ?

J'ai un ACER Aspire E5-575G

J'ai fait ce que vous m'avez proposé après avec le trusted file mais je n'ai pas vu de changement dans les boot dont j'peux modifier l'ordre.
J'ai mis Windows Boot Manager après le Boot directement sur le disque dur et evidemment cela n'a pas fonctionné.

Concernant Windows Boot Manager, ce que je comprends pas, c'est que selon ce que Boot-repair m'a dit, son path devrait etre : \EFI\ubuntu\shimx64.efi.
Et je ne vois aucun changement

Edit: j'ai rien dit, je viens de le voir.
Merci beaucoup à vous

malbo

Je crois comprendre que tu as trouvé une solution. Si tu parviens à démarrer une session sur ton Ubuntu installé, ce serait utile que tu fasses un Boot-info depuis une session de ce Ubuntu installé et que tu donnes l'URL de ce Boot-info dans ta réponse afin qu'on puisse voir dans quel état se trouve ton installation.

Broot

malbo a écritce serait utile que tu fasses un Boot-info depuis une session de ce Ubuntu installé et que tu donnes l'URL de ce Boot-info d

S'il-vous-plait https://paste.ubuntu.com/p/fsvgrdhcYJ/

malbo

Je colle ci-dessous le contenu du Boot-info dont tu as donné le lien ( https://paste.ubuntu.com/p/fsvgrdhcYJ/ ) dans le post #8 :

boot-info-4ppa125                                              [20201209_2001]

============================== Boot Info Summary ===============================

 => No boot loader is installed in the MBR of /dev/sda.
 => Grub2 (v2.00) is installed in the MBR of /dev/sdb and looks at sector 
    250062848 of the same hard drive for core.img. core.img is at this 
    location and looks for (,gpt5)/boot/grub. It also embeds following 
    components:
    
    modules
    ---------------------------------------------------------------------------
    fshelp ext2 part_gpt biosdisk
    ---------------------------------------------------------------------------

sda1: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows 8/2012: NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        /boot/grub/i386-pc/core.img

sda2: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info: 
    Operating System:  
    Boot files:        

sdb1: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  Windows 8/2012: FAT32
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        /efi/Boot/bkpbootx64.efi /efi/Boot/bootx64.efi 
                       /efi/Boot/fbx64.efi /efi/Boot/grubx64.efi 
                       /efi/Boot/mmx64.efi /efi/ubuntu/grubx64.efi 
                       /efi/ubuntu/mmx64.efi /efi/ubuntu/shimx64.efi 
                       /efi/ubuntu/grub.cfg /efi/Microsoft/Boot/bootmgfw.efi 
                       /efi/Microsoft/Boot/bootmgr.efi 
                       /efi/Microsoft/Boot/memtest.efi 
                       /efi/OEM/Boot/bootmgfw.efi /efi/OEM/Boot/bootmgr.efi 
                       /efi/OEM/Boot/memtest.efi

sdb2: __________________________________________________________________________

    File system:       
    Boot sector type:  -
    Boot sector info: 

sdb3: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows 8/2012: NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  Windows 10
    Boot files:        /bootmgr /Windows/System32/winload.exe

sdb4: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows 8/2012: NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        

sdb5: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info: 
    Operating System:  Ubuntu 20.04.1 LTS
    Boot files:        /boot/grub/grub.cfg /etc/fstab /etc/default/grub

sdb6: __________________________________________________________________________

    File system:       BIOS Boot partition
    Boot sector type:  Grub2's core.img
    Boot sector info: 


================================ 2 OS detected =================================

OS#1:   The OS now in use - Ubuntu 20.04.1 LTS CurrentSession on sdb5
OS#2:   Windows 10 on sdb3

============================ Architecture/Host Info ============================

CPU architecture: 64-bit
BOOT_IMAGE of the installed session in use:
/boot/vmlinuz-5.4.0-56-generic root=UUID=c93c55b7-7ddf-4dd3-99f4-3fc88164e52b ro quiet splash vt.handoff=7


===================================== UEFI =====================================

BIOS is EFI-compatible, and is setup in EFI-mode for this installed-session.
SecureBoot enabled.

efibootmgr -v
BootCurrent: 0002
Timeout: 0 seconds
BootOrder: 0002,0001,0000,2001,2002,2003
Boot0000* Linux	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\Boot\grubx64.efi)RC
Boot0001* Windows Boot Manager	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)RC
Boot0002* LinuxBoot	PciRoot(0x0)/Pci(0x17,0x0)/Sata(2,0,0)/HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)A01 ..
Boot0003* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0004* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0005* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0006* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0007* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0008* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0009* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot2001* EFI USB Device	RC
Boot2002* EFI DVD/CDROM	RC
Boot2003* EFI Network	RC

78415fb8fb9b909f8029858113f1335f   sdb1/Boot/bkpbootx64.efi
78415fb8fb9b909f8029858113f1335f   sdb1/Boot/bootx64.efi
2895d47544fd587b26c7e29be1295c27   sdb1/Boot/fbx64.efi
8ed07d5ee4e5e1534bcf64037b7589ff   sdb1/Boot/grubx64.efi
dc3c47be2f78a78e5e57d097ae6c5c84   sdb1/Boot/mmx64.efi
8ed07d5ee4e5e1534bcf64037b7589ff   sdb1/ubuntu/grubx64.efi
dc3c47be2f78a78e5e57d097ae6c5c84   sdb1/ubuntu/mmx64.efi
78415fb8fb9b909f8029858113f1335f   sdb1/ubuntu/shimx64.efi
e69be5ddc7c4165e0f3e5ee05d267ec2   sdb1/Microsoft/Boot/bootmgfw.efi
5a0ceb06ab09d5c2be36b38bcb33617f   sdb1/Microsoft/Boot/bootmgr.efi
63d035caf33c9fb1533165ddd38dacbc   sdb1/OEM/Boot/bootmgfw.efi
6c6caf61867647ffe470e6121e3c68dd   sdb1/OEM/Boot/bootmgr.efi


============================= Drive/Partition Info =============================

Disks info: ____________________________________________________________________

sdb	: is-GPT,	hasBIOSboot,	has---ESP, 	not-usb,	not-mmc, has-os,	2048 sectors * 512 bytes
sda	: is-GPT,	no-BIOSboot,	has-noESP, 	not-usb,	not-mmc, no-os,	2048 sectors * 512 bytes

Partitions info (1/3): _________________________________________________________

sdb5	: is-os,	64, apt-get,	signed grub-pc grub-efi ,	grub2,	grub-install,	grubenv-ok,	update-grub,	farbios
sda1	: no-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	farbios
sda2	: no-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	farbios
sdb1	: no-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	not-far
sdb3	: is-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	not-far
sdb4	: no-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	farbios

Partitions info (2/3): _________________________________________________________

sdb5	: isnotESP,	fstab-has-goodEFI,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot
sda1	: isnotESP,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot
sda2	: isnotESP,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot
sdb1	: is---ESP,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot
sdb3	: isnotESP,	part-has-no-fstab,	no-nt,	haswinload,	no-recov-nor-hid,	bootmgr,	notwinboot
sdb4	: isnotESP,	part-has-no-fstab,	no-nt,	no-winload,	recovery-or-hidden,	no-bmgr,	notwinboot

Partitions info (3/3): _________________________________________________________

sdb5	: not-sepboot,	with-boot,	fstab-without-boot,	not-sep-usr,	with--usr,	fstab-without-usr,	std-grub.d,	sdb
sda1	: not-sepboot,	no-kernel,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sda
sda2	: maybesepboot,	no-boot,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sda
sdb1	: not-sepboot,	no-boot,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sdb
sdb3	: not-sepboot,	no-boot,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sdb
sdb4	: not-sepboot,	no-boot,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sdb

fdisk -l (filtered): ___________________________________________________________

Disk sda: 465.78 GiB, 500107862016 bytes, 976773168 sectors
Disk identifier: 6709357D-8D86-4E98-B91B-1F85C7CFAC26
          Start       End   Sectors   Size Type
sda1       2048 464773119 464771072 221.6G Microsoft basic data
sda2  464773120 976771166 511998047 244.1G Linux filesystem
Disk sdb: 119.25 GiB, 128035676160 bytes, 250069680 sectors
Disk identifier: 805DB973-7673-4600-A157-489ABCF0C0CE
          Start       End   Sectors    Size Type
sdb1       2048    206847    204800    100M EFI System
sdb2     206848    239615     32768     16M Microsoft reserved
sdb3     239616 193582546 193342931   92.2G Microsoft basic data
sdb4  247971840 250061683   2089844 1020.4M Windows recovery environment
sdb5  193583104 247969822  54386719     26G Linux filesystem
sdb6  250062848 250068991      6144      3M BIOS boot
Partition table entries are not in disk order.

parted -lm (filtered): _________________________________________________________

sda:500GB:scsi:512:4096:gpt:ATA TOSHIBA MQ01ABF0:;
1:1049kB:238GB:238GB:ntfs:Windows:msftdata;
2:238GB:500GB:262GB:ext4::;
sdb:128GB:scsi:512:512:gpt:ATA KINGSTON RBUSNS8:;
1:1049kB:106MB:105MB:fat32:EFI system partition:boot, esp;
2:106MB:123MB:16.8MB::Microsoft reserved partition:msftres;
3:123MB:99.1GB:99.0GB:ntfs:Basic data partition:msftdata;
5:99.1GB:127GB:27.8GB:ext4::;
4:127GB:128GB:1070MB:ntfs::hidden, diag;
6:128GB:128GB:3146kB:::bios_grub;

blkid (filtered): ______________________________________________________________

NAME   FSTYPE   UUID                                 PARTUUID                             LABEL    PARTLABEL
sda                                                                                                
â”œâ”€sda1 ntfs     3C0C1CE30C1C9A4A                     db592755-a635-4630-aa77-31ae92b3a58c Data     Windows
â””â”€sda2 ext4     34c985d5-5a9f-444a-90f5-ae476ada0395 dde8d2fb-6787-4da3-b371-c195fd5032ff          
sdb                                                                                                
â”œâ”€sdb1 vfat     B410-0716                            a3842291-4a30-40a7-b9ed-a1a68ac8d87a ESP      EFI system partition
â”œâ”€sdb2                                               2932984c-405f-4be2-b4c7-881c77bee7bb          Microsoft reserved partition
â”œâ”€sdb3 ntfs     9668179668177469                     fa43381e-c876-47a3-812a-236b90839744 Acer     Basic data partition
â”œâ”€sdb4 ntfs     0A3E18703E185753                     889f7e74-a8d4-4a3d-bbfb-492c7182a433 Recovery Basic data partition
â”œâ”€sdb5 ext4     c93c55b7-7ddf-4dd3-99f4-3fc88164e52b be94e480-d0ff-493a-9358-09276b5aadf9          
â””â”€sdb6                                               716c87f7-4c04-4b41-9ac4-b450a25b9818          

df (filtered): _________________________________________________________________

                   Avail Use% Mounted on
sda1                163G  26% /mnt/boot-sav/sda1
sda2                186G  17% /home
sdb3                7.7G  92% /mnt/boot-sav/sdb3
sdb4              528.2M  48% /mnt/boot-sav/sdb4
sdb5               14.3G  39% /

Mount options: __________________________________________________________________

sda1              rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
sda2              rw,relatime
sdb3              rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
sdb4              rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
sdb5              rw,relatime,errors=remount-ro

==================== sda1: Location of files loaded by Grub ====================

           GiB - GB             File                                 Fragment(s)
            ?? = ??             boot/grub/i386-pc/core.img                     1

===================== sdb1/efi/ubuntu/grub.cfg (filtered) ======================

search.fs_uuid c93c55b7-7ddf-4dd3-99f4-3fc88164e52b root hd2,gpt5 
set prefix=($root)'/boot/grub'
configfile $prefix/grub.cfg

====================== sdb5/boot/grub/grub.cfg (filtered) ======================

Ubuntu   c93c55b7-7ddf-4dd3-99f4-3fc88164e52b
Ubuntu, with Linux 5.4.0-56-generic   c93c55b7-7ddf-4dd3-99f4-3fc88164e52b
Ubuntu, with Linux 5.4.0-42-generic   c93c55b7-7ddf-4dd3-99f4-3fc88164e52b
Windows Boot Manager (on sdc1)   osprober-efi-B410-0716
### END /etc/grub.d/30_os-prober ###
UEFI Firmware Settings   uefi-firmware
### END /etc/grub.d/30_uefi-firmware ###

========================== sdb5/etc/fstab (filtered) ===========================

# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sdc5 during installation
UUID=c93c55b7-7ddf-4dd3-99f4-3fc88164e52b /               ext4    errors=remount-ro 0       1
# /boot/efi was on /dev/sdc1 during installation
# /home was on /dev/sda2 during installation
UUID=34c985d5-5a9f-444a-90f5-ae476ada0395 /home           ext4    defaults        0       2
/swapfile                                 none            swap    sw              0       0
UUID=B410-0716  /boot/efi       vfat    defaults      0       1

======================= sdb5/etc/default/grub (filtered) =======================

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

==================== sdb5: Location of files loaded by Grub ====================

           GiB - GB             File                                 Fragment(s)
 108.571807861 = 116.578091008  boot/grub/grub.cfg                             3
  97.662246704 = 104.864038912  boot/vmlinuz                                   1
  96.359493256 = 103.465218048  boot/vmlinuz-5.4.0-42-generic                  2
  97.662246704 = 104.864038912  boot/vmlinuz-5.4.0-56-generic                  1
  96.359493256 = 103.465218048  boot/vmlinuz.old                               2
  97.971397400 = 105.195986944  boot/initrd.img                                2
 100.364635468 = 107.765706752  boot/initrd.img-5.4.0-42-generic               2
  97.971397400 = 105.195986944  boot/initrd.img-5.4.0-56-generic               2
 100.364635468 = 107.765706752  boot/initrd.img.old                            2

===================== sdb5: ls -l /etc/grub.d/ (filtered) ======================

-rwxr-xr-x 1 root root 17622 Nov 13 00:15 10_linux
-rwxr-xr-x 1 root root 42359 Nov 13 00:15 10_linux_zfs
-rwxr-xr-x 1 root root 12894 Jul 31 02:34 20_linux_xen
-rwxr-xr-x 1 root root 12059 Jul 31 02:34 30_os-prober
-rwxr-xr-x 1 root root  1424 Jul 31 02:34 30_uefi-firmware
-rwxr-xr-x 1 root root   214 Jul 31 02:34 40_custom
-rwxr-xr-x 1 root root   216 Jul 31 02:34 41_custom


Suggested repair: ______________________________________________________________

The default repair of the Boot-Repair utility would reinstall the grub-efi-amd64-signed of
sdb5,
using the following options:        sdb1/boot/efi,
Additional repair would be performed: unhide-bootmenu-10s win-legacy-basic-fix use-standard-efi-file  restore-efi-backups  

Confirmation request before suggested repair: __________________________________

The boot of your PC is in Secure mode. You may want to retry after changing it to non-Secure mode.
Are you sure you want to continue anyway?

Final advice in case of suggested repair: ______________________________________


Please do not forget to make your UEFI firmware boot on the The OS now in use - Ubuntu 20.04.1 LTS CurrentSession entry (sdb1/efi/****/shim****.efi (**** will be updated in the final message) file) !
If your computer reboots directly into Windows, try to change the boot order in your UEFI firmware.

If your UEFI firmware does not allow to change the boot order, change the default boot entry of the Windows bootloader.
For example you can boot into Windows, then type the following command in an admin command prompt:
bcdedit /set {bootmgr} path \EFI\****\shim****.efi (**** will be updated in the final message)

On peut voir ta réussite dans cet extrait :

===================================== UEFI =====================================

BIOS is EFI-compatible, and is setup in EFI-mode for this installed-session.
SecureBoot enabled.

efibootmgr -v
BootCurrent: 0002
Timeout: 0 seconds
BootOrder: 0002,0001,0000,2001,2002,2003
Boot0000* Linux	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\Boot\grubx64.efi)RC
Boot0001* Windows Boot Manager	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)RC
Boot0002* LinuxBoot	PciRoot(0x0)/Pci(0x17,0x0)/Sata(2,0,0)/HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)A01 ..
Boot0003* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0004* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0005* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0006* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0007* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0008* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0009* Unknown Device: 	HD(1,GPT,a3842291-4a30-40a7-b9ed-a1a68ac8d87a,0x800,0x32000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot2001* EFI USB Device	RC
Boot2002* EFI DVD/CDROM	RC
Boot2003* EFI Network	RC

La ligne "BootCurrent" indique que le démarrage se fait sur l'entrée 0002 qui est l'entrée que tu as nommée "LinuxBoot" en appliquant la méthode Gesbuklu proposée par ikewdu dans le post #3
On peut voir aussi la ligne "SecureBoot enabled", ce qui prouve que tu as suivi mon conseil du post #4

EDIT : je te prie de fermer la discussion en procédant comme suit :
1) te connecter sur le forum
2) cliquer sur "Modifier" en bas à droite de ton PREMIER post
3) modifier le titre de la discussion pour qu'il devienne :

[Résolu] Je rencontre des difficultés à installer Ubuntu à coté de Windows 10