Debian Install error "Reboot and select proper boot device"

Posted on August 19, 2022
Tags: Linux, Debian, IT

I encountered this error for the first time when booting on a fresh Debian Bullseye Install.

I tried different things but for me the solution was this one (by user srs5694), I allow myself to share it because it took me some time to find it.

  1. Boot to an emergency system.

  2. Mount /dev/sda1 somewhere convenient – let’s say /boot/efi.

  3. Type “cd /boot/efi/EFI”.

  4. Type “sudo cp -r ubuntu BOOT”

  5. Type “sudo mv BOOT/shimx64.efi BOOT/bootx64.efi”

  6. Reboot. The system should come up normally.

Hope it helps.