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Yes, i lost hope to restore my installation, i'll do a fresh one. Agree :mad: Thank you all for your time and your replies

No, the problem appeared after a major update of Windows. I used dual boot since Windows 2000, first with LILO as boot loader and later with GRUB. I don't remember a time when i can't restore boot loader after that Windows broke it (e.g. after a Windows re-installation). This time seems that...

Yes, Windows starts correctly without problem. I also think that the only solution is reinstall linux. Thanks a lot for your time.

Thank you. I tried to execute the command but unfortunately it can't help me. This is the response: dumpe2fs 1.44.1 (24-Mar-2018) dumpe2fs: Bad magic number in super-block while trying to open /dev/sda6 Couldn't find valid filesystem superblock.

Hi, after a few days I managed to do some tests with testdisk. This is the result of the analyses: Disk /dev/sda - 525 GB / 489 GiB - CHS 63841 255 63 Current partition structure: Partition Start End Size in sectors 1 P Unknown 2048...

Thank you very much for your time, but unfortunately, as I wrote in previous reply, I can't mount the partition, and therefore not even use chroot command

The problem is that /dev/sda6 (the linux partition) is unmountable. This the output: > sudo mount /dev/sda6 /mnt/disk mount: /mnt/disk: wrong fs type, bad option, bad superblock on /dev/sda6, missing codepage or helper program, or other error. and fsck also can do nothing: > fsck...

Thank you for your reply. I'm not sure I understand the meaning of your command, but this is the output: sudo chroot /usr/sbin/update-grub chroot: cannot change root directory to '/usr/sbin/update-grub': Not a directory I would like to launch update-grub after setting root in /dev/sda6...

I have a pc with dual-boot win10 / ubuntu 18.04 After a Windows update, i can't start Ubuntu, Grub starts in command-line mode. I start pc with a live version of Ubuntu and these are my attempts: fdisk -l /dev/sda Disk /dev/sda: 489.1 GiB, 525112713216 bytes, 1025610768 sectors Units...