Voici ton Boot-info :
boot-info-4ppa125 [20210104_2039]
============================== Boot Info Summary ===============================
=> Grub2 (v2.00) is installed in the MBR of /dev/sda and looks at sector 1 of
the same hard drive for core.img. core.img is at this location and looks
for (,msdos1)/boot/grub. It also embeds following components:
modules
---------------------------------------------------------------------------
fshelp ext2 part_msdos biosdisk
---------------------------------------------------------------------------
sda1: __________________________________________________________________________
File system: vfat
Boot sector type: FAT32
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /efi/BOOT/fbx64.efi /efi/BOOT/mmx64.efi
/efi/ubuntu/grubx64.efi /efi/ubuntu/mmx64.efi
/efi/ubuntu/shimx64.efi /efi/ubuntu/grub.cfg
sda2: __________________________________________________________________________
File system: Extended Partition
Boot sector type: -
Boot sector info:
sda5: __________________________________________________________________________
File system: swap
Boot sector type: -
Boot sector info:
sda6: __________________________________________________________________________
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
================================ 1 OS detected =================================
OS#1: L'OS actuellement utilisé - Ubuntu 20.04.1 LTS CurrentSession on sda6
============================ Architecture/Host Info ============================
CPU architecture: 64-bit
BOOT_IMAGE of the installed session in use:
/boot/vmlinuz-5.4.0-58-generic root=UUID=515447bc-ca47-4804-ad3a-4639ed706f25 ro quiet splash vt.handoff=7
===================================== UEFI =====================================
BIOS is EFI-compatible, and is setup in EFI-mode for this installed-session.
SecureBoot disabled.
efibootmgr -v
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0000,0004,0003,0002
Boot0000* ubuntu HD(1,MBR,0x19d215c,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
Boot0002* CD/DVD Drive BBS(CDROM,,0x0)AMGOAMNO........o.S.l.i.m.t.y.p.e. .D.V.D. .A. . .D.S.8.A.8.S.H....................A...........................>..Gd-.;.A..MQ..L.2.3.8.0.8.5. .3.A.6.2.6.5.2.0.4.2.2.5.2......AMBO
Boot0003* Hard Drive BBS(HD,,0x0)AMGOAMNO........o.S.T.1.0.0.0.D.M.0.0.3.-.9.Y.N.1.6.2....................A...........................>..Gd-.;.A..MQ..L. . . . . . . . . . . . .1.Z.1.D.P.S.S.Z......AMBO
Boot0004* ubuntu HD(1,MBR,0x19d215c,0x800,0x100000)/File(EFI\Ubuntu\grubx64.efi)
2895d47544fd587b26c7e29be1295c27 sda1/BOOT/fbx64.efi
dc3c47be2f78a78e5e57d097ae6c5c84 sda1/BOOT/mmx64.efi
8ed07d5ee4e5e1534bcf64037b7589ff sda1/ubuntu/grubx64.efi
dc3c47be2f78a78e5e57d097ae6c5c84 sda1/ubuntu/mmx64.efi
78415fb8fb9b909f8029858113f1335f sda1/ubuntu/shimx64.efi
78415fb8fb9b909f8029858113f1335f sda1/BOOT/BOOTX64.efi
============================= Drive/Partition Info =============================
Disks info: ____________________________________________________________________
sda : notGPT, no-BIOSboot, has---ESP, not-usb, not-mmc, has-os, 2048 sectors * 512 bytes
Partitions info (1/3): _________________________________________________________
sda6 : 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, not-far
Partitions info (2/3): _________________________________________________________
sda6 : isnotESP, fstab-has-goodEFI, no-nt, no-winload, no-recov-nor-hid, no-bmgr, notwinboot
sda1 : is---ESP, part-has-no-fstab, no-nt, no-winload, no-recov-nor-hid, no-bmgr, notwinboot
Partitions info (3/3): _________________________________________________________
sda6 : not-sepboot, with-boot, fstab-without-boot, not-sep-usr, with--usr, fstab-without-usr, std-grub.d, sda
sda1 : not-sepboot, no-boot, part-has-no-fstab, not-sep-usr, no---usr, part-has-no-fstab, std-grub.d, sda
fdisk -l (filtered): ___________________________________________________________
Disk sda: 931.53 GiB, 1000204886016 bytes, 1953525168 sectors
Disk identifier: 0x019d215c
Boot Start End Sectors Size Id Type
sda1 * 2048 1050623 1048576 512M ef EFI (FAT-12/16/32)
sda2 1052670 1953523711 1952471042 931G 5 Extended
sda5 1945370624 1953523711 8153088 3.9G 82 Linux swap / Solaris
sda6 1052672 1945370623 1944317952 927.1G 83 Linux
Partition table entries are not in disk order.
parted -lm (filtered): _________________________________________________________
sda:1000GB:scsi:512:4096:msdos:ATA ST1000DM003-9YN1:;
1:1049kB:538MB:537MB:fat32::boot, esp;
2:539MB:1000GB:1000GB:::;
6:539MB:996GB:995GB:ext4::;
5:996GB:1000GB:4174MB:linux-swap(v1)::;
blkid (filtered): ______________________________________________________________
NAME FSTYPE UUID PARTUUID LABEL PARTLABEL
sda
├─sda1 vfat ACF3-88FA 019d215c-01
├─sda2 019d215c-02
├─sda5 swap fe0d9a06-7716-473c-b227-8c174c4b7ee5 019d215c-05
└─sda6 ext4 515447bc-ca47-4804-ad3a-4639ed706f25 019d215c-06
df (filtered): _________________________________________________________________
Avail Use% Mounted on
sda6 836.3G 3% /
Mount options: __________________________________________________________________
sda6 rw,relatime,errors=remount-ro
===================== sda1/efi/ubuntu/grub.cfg (filtered) ======================
search.fs_uuid 515447bc-ca47-4804-ad3a-4639ed706f25 root hd0,msdos6
set prefix=($root)'/boot/grub'
configfile $prefix/grub.cfg
====================== sda6/boot/grub/grub.cfg (filtered) ======================
Ubuntu 515447bc-ca47-4804-ad3a-4639ed706f25
Ubuntu, avec Linux 5.4.0-58-generic 515447bc-ca47-4804-ad3a-4639ed706f25
Ubuntu, avec Linux 5.4.0-42-generic 515447bc-ca47-4804-ad3a-4639ed706f25
### END /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_uefi-firmware ###
========================== sda6/etc/fstab (filtered) ===========================
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda6 during installation
UUID=515447bc-ca47-4804-ad3a-4639ed706f25 / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda1 during installation
UUID=ACF3-88FA /boot/efi vfat umask=0077 0 1
/swapfile none swap sw 0 0
======================= sda6/etc/default/grub (filtered) =======================
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
==================== sda6: Location of files loaded by Grub ====================
GiB - GB File Fragment(s)
448,857563019 = 481,957138432 boot/grub/grub.cfg 2
449,770645142 = 482,937552896 boot/vmlinuz 2
5,067501068 = 5,441187840 boot/vmlinuz-5.4.0-42-generic 1
449,770645142 = 482,937552896 boot/vmlinuz-5.4.0-58-generic 2
5,067501068 = 5,441187840 boot/vmlinuz.old 1
4,547698975 = 4,883054592 boot/initrd.img 5
6,343429565 = 6,811205632 boot/initrd.img-5.4.0-42-generic 1
4,547698975 = 4,883054592 boot/initrd.img-5.4.0-58-generic 5
6,343429565 = 6,811205632 boot/initrd.img.old 1
===================== sda6: 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 juil. 31 02:34 20_linux_xen
-rwxr-xr-x 1 root root 12059 juil. 31 02:34 30_os-prober
-rwxr-xr-x 1 root root 1424 juil. 31 02:34 30_uefi-firmware
-rwxr-xr-x 1 root root 214 juil. 31 02:34 40_custom
-rwxr-xr-x 1 root root 216 juil. 31 02:34 41_custom
Suggested repair: ______________________________________________________________
The default repair of the Boot-Repair utility would reinstall the grub-efi-amd64-signed of
sda6,
using the following options: sda1/boot/efi,
Additional repair would be performed: unhide-bootmenu-10s use-standard-efi-file
Final advice in case of suggested repair: ______________________________________
Please do not forget to make your UEFI firmware boot on the L'OS actuellement utilisé - Ubuntu 20.04.1 LTS CurrentSession entry (sda1/efi/****/shim****.efi (**** will be updated in the final message) file) !
Je pense que tu as dû faire le le choix "Supprimer Ubuntu 20.04.1 LTS et réinstaller" lors de ta réinstallation :

Tu aurais dû sélectionner "Effacer le disque et installer Ubuntu" parce que ça aurait entraîné la création d'une table de partition GPT (au lieu du type MSDOS actuel) et ça aurait évité d'avoir une partition swap (sda5) inutilisée. En faisant une recherche de l'UUID
fe0d9a06-7716-473c-b227-8c174c4b7ee5 dans le Boot-info, tu pourras voir que cette partition sda5 n'est pas utilisée. Ce qui est utilisé, c'est un fichier swapfile de la partition racine sda6 comme on peut voir dans cet extrait relatif au fstab :
========================== sda6/etc/fstab (filtered) ===========================
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda6 during installation
UUID=515447bc-ca47-4804-ad3a-4639ed706f25 / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda1 during installation
UUID=ACF3-88FA /boot/efi vfat umask=0077 0 1
/swapfile none swap sw 0 0
Malgré tout, je pense que tu peux laisser en l'état. Mais si un jour, tu dois virer cette installation, fais une installation toute neuve avec le choix "Effacer le disque et installer Ubuntu".
EDIT : comme prévu dans le post #32, je viens d'ajouter ton modèle K95VM dans la
Liste des portables « Asus »