Salut à tous,

Après une mise à jour Windows, j'ai eu un problème avec Grub: impossible de booter sur Windows ou bien Ubuntu. J'ai donc regardé a droite à gauche quoi et j'ai donc utilisé boot repair. Depuis mon PC boot sous windows mais pas sous ubuntu (pas de grub). J'ai tenté de booter sur Ubuntu avec Super Grub2 Disk mais il ne detecte que ma partition windows...
Le disque semble toujours partitionner comme avant car je retrouve la partition swap etc mais celle où se trouvait ubuntu semble vide, comme si elle avait été formaté ou illisible?
Voici le rapport boot repair

Quelqu'un aurait une idée car j'aimerai récuperer les documents sur ma partition Ubuntu si possible, et la plus part des solutions que je trouve sur les forum (Boot repair et Super Grub Disk) ne fonctionne pas
Bonjour,

Collage du rapport, pour les spécialistes :
boot-repair-4ppa125                                              [20201107_0835]

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

 => Syslinux MBR (5.00 and higher) is installed in the MBR of /dev/sda.

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:        /bootmgr /Boot/BCD

sda2: __________________________________________________________________________

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

sda3: __________________________________________________________________________

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

sda5: __________________________________________________________________________

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

sdb: ___________________________________________________________________________

    File system:       iso9660
    Boot sector type:  Unknown
    Boot sector info: 
    Mounting failed:   mount: /mnt/BootInfo/FD/sdb: /dev/sdb déjà monté ou point de montage actif.


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

OS#1:   Windows 10 (boot) on sda1
OS#2:   Windows XP on sda2

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

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


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

This live-session is not in EFI-mode.



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

Disks info: ____________________________________________________________________

sda	: notGPT,	no-BIOSboot,	has-noESP, 	not-usb,	not-mmc, has-os,	2048 sectors * 512 bytes

Partitions info (1/3): _________________________________________________________

sda1	: is-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	not-far
sda2	: is-os,	32, nopakmgr,	no-docgrub,	nogrub,	nogrubinstall,	no-grubenv,	noupdategrub,	farbios

Partitions info (2/3): _________________________________________________________

sda1	: isnotESP,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	bootmgr,	is-winboot
sda2	: isnotESP,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot

Partitions info (3/3): _________________________________________________________

sda1	: not-sepboot,	no-boot,	part-has-no-fstab,	not-sep-usr,	no---usr,	part-has-no-fstab,	std-grub.d,	sda
sda2	: 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: 232.91 GiB, 250059350016 bytes, 488397168 sectors
Disk identifier: 0xd9bef6b2
      Boot     Start       End   Sectors   Size Id Type
sda1  *         2048   1126399   1124352   549M  7 HPFS/NTFS/exFAT
sda2         1126400 270266365 269139966 128.3G  7 HPFS/NTFS/exFAT
sda3       270266366 488396799 218130434   104G  5 Extended
sda5       471816192 488396799  16580608   7.9G 82 Linux swap / Solaris
Disk sdb: 232.91 GiB, 250059350016 bytes, 488397168 sectors
Disk identifier: 0x56f48570
      Boot   Start       End   Sectors   Size Id Type
sdb1  *          0   5439487   5439488   2.6G  0 Empty
sdb2       5017392   5025327      7936   3.9M ef EFI (FAT-12/16/32)
sdb3       5439488 488397167 482957680 230.3G 83 Linux

parted -lm (filtered): _________________________________________________________

sda:250GB:scsi:512:512:msdos:ATA ST9250410AS:;
1:1049kB:577MB:576MB:ntfs::boot;
2:577MB:138GB:138GB:ntfs::;
3:138GB:250GB:112GB:::;
5:242GB:250GB:8489MB:linux-swap(v1)::;
sdb:250GB:scsi:512:512:unknown:ASMT 2105:;

blkid (filtered): ______________________________________________________________

NAME   FSTYPE   UUID                                 PARTUUID                             LABEL                    PARTLABEL
sda                                                                                                                
├─sda1 ntfs     480A60A20A608EAE                     d9bef6b2-01                          Réservé au système       
├─sda2 ntfs     B8CC6719CC66D0E4                     d9bef6b2-02                                                   
├─sda3                                               d9bef6b2-03                                                   
└─sda5 swap     2a2bbcc6-1834-42a7-85dc-99cd27f8e3e6 d9bef6b2-05                                                   
sdb    iso9660  2020-07-31-16-51-12-00                                                    Ubuntu 20.04.1 LTS amd64 
├─sdb1 iso9660  2020-07-31-16-51-12-00               56f48570-01                          Ubuntu 20.04.1 LTS amd64 
├─sdb2 vfat     C26E-047E                            56f48570-02                                                   
└─sdb3 ext4     1d03a282-4898-4a23-9caf-4cdd04fba1aa 56f48570-03                          writable                 

df (filtered): _________________________________________________________________

                                                          Avail Use% Mounted on
disk/by-label/writable[/install-logs-2020-11-07.0/crash] 214.1G   0% /var/crash
disk/by-label/writable[/install-logs-2020-11-07.0/log]   214.1G   0% /var/log
sda1                                                     117.8M  79% /mnt/boot-sav/sda1
sda2                                                      60.4G  53% /mnt/boot-sav/sda2
sdb1                                                          0 100% /cdrom

Mount options: __________________________________________________________________

disk/by-label/writable[/install-logs-2020-11-07.0/crash] rw,relatime
disk/by-label/writable[/install-logs-2020-11-07.0/log]   rw,relatime
sda1                                                     ro,relatime,user_id=0,group_id=0,allow_other,blksize=4096
sda2                                                     ro,relatime,user_id=0,group_id=0,allow_other,blksize=4096
sdb1                                                     ro,noatime,nojoliet,check=s,map=n,blocksize=2048


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

Unknown BootLoader on sdb

00000000  45 52 08 00 00 00 90 90  00 00 00 00 00 00 00 00  |ER..............|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000020  33 ed fa 8e d5 bc 00 7c  fb fc 66 31 db 66 31 c9  |3......|..f1.f1.|
00000030  66 53 66 51 06 57 8e dd  8e c5 52 be 00 7c bf 00  |fSfQ.W....R..|..|
00000040  06 b9 00 01 f3 a5 ea 4b  06 00 00 52 b4 41 bb aa  |.......K...R.A..|
00000050  55 31 c9 30 f6 f9 cd 13  72 16 81 fb 55 aa 75 10  |U1.0....r...U.u.|
00000060  83 e1 01 74 0b 66 c7 06  f3 06 b4 42 eb 15 eb 02  |...t.f.....B....|
00000070  31 c9 5a 51 b4 08 cd 13  5b 0f b6 c6 40 50 83 e1  |1.ZQ....[...@P..|
00000080  3f 51 f7 e1 53 52 50 bb  00 7c b9 04 00 66 a1 b0  |?Q..SRP..|...f..|
00000090  07 e8 44 00 0f 82 80 00  66 40 80 c7 02 e2 f2 66  |..D.....f@.....f|
000000a0  81 3e 40 7c fb c0 78 70  75 09 fa bc ec 7b ea 44  |.>@|..xpu....{.D|
000000b0  7c 00 00 e8 83 00 69 73  6f 6c 69 6e 75 78 2e 62  ||.....isolinux.b|
000000c0  69 6e 20 6d 69 73 73 69  6e 67 20 6f 72 20 63 6f  |in missing or co|
000000d0  72 72 75 70 74 2e 0d 0a  66 60 66 31 d2 66 03 06  |rrupt...f`f1.f..|
000000e0  f8 7b 66 13 16 fc 7b 66  52 66 50 06 53 6a 01 6a  |.{f...{fRfP.Sj.j|
000000f0  10 89 e6 66 f7 36 e8 7b  c0 e4 06 88 e1 88 c5 92  |...f.6.{........|
00000100  f6 36 ee 7b 88 c6 08 e1  41 b8 01 02 8a 16 f2 7b  |.6.{....A......{|
00000110  cd 13 8d 64 10 66 61 c3  e8 1e 00 4f 70 65 72 61  |...d.fa....Opera|
00000120  74 69 6e 67 20 73 79 73  74 65 6d 20 6c 6f 61 64  |ting system load|
00000130  20 65 72 72 6f 72 2e 0d  0a 5e ac b4 0e 8a 3e 62  | error...^....>b|
00000140  04 b3 07 cd 10 3c 0a 75  f1 cd 18 f4 eb fd 00 00  |.....<.u........|
00000150  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
000001b0  f4 8d 05 00 00 00 00 00  70 85 f4 56 00 00 80 00  |........p..V....|
000001c0  01 00 00 a5 e0 ff 00 00  00 00 00 00 53 00 00 fe  |............S...|
000001d0  ff ff ef fe ff ff 30 8f  4c 00 00 1f 00 00 00 97  |......0.L.......|
000001e0  46 52 83 50 bf c1 00 00  53 00 70 59 c9 1c 00 00  |FR.P....S.pY....|
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:[153767]) leaked on lvs invocation. Parent PID 11519: /bin/bash

Suggested repair: ______________________________________________________________

The default repair of the Boot-Repair utility would restore the [(generic mbr)] MBR in sda, and make it boot on sda1.
Additional repair would be performed: unhide-bootmenu-10s win-legacy-basic-fix