Broken MBR / GRUB can't boot on Qubes OS partition SOLVED

[kkscr]

The issue

After are bad installation of a linux live usb ( which I believe have re-written the MBR of my laptop harddrive instead of the one of the thumb drive ) I can’t boot on my Qubes OS partition any more. I have a dual boot with three main partitions:
one for windows, one for data storage ( ext4 ) and one for qubes OS ( see picture )

What I have done so far

My first attempt was to use boot-repair automatic repair → the computer was booting on windows.
Then I used boot-repair to manually set the boot flag to nvme0np5 which I believe is the grub partition , but it didn’t worked.

What are my options to fix this issue ? I can provide more information if needed

[apparatus]

You can try to mount and chroot into your Qubes OS from some Live USB and reinstall GRUB like this:

Stuck in Grub Recovery after installing Second OS to alternate Hard drive. How to recover?

Untested, assuming /dev/sda is your Qubes OS drive: cryptsetup luksOpen /dev/sda2 luks-qubes vgchange -ay mkdir /mnt/qubes mount /dev/qubes_dom0/root /mnt/qubes cd /mnt/qubes mount /dev/sda1 boot # Backup the /boot partition cp -r boot root/boot-backup mount -t proc /proc proc mount -t sysfs /sys sys mount --rbind /dev dev mount --rbind /run run chroot . grub-install /dev/sda After running grub2-mkconfig command below you only will be able to boot into Qubes OS. If you want to be able to boot…

[kkscr]

<3 <3 <3 that worked !