On 28/07/2023 at 20:13, Zvi Vered wrote:
You wrote: "Most likely the system was booted in legacy BIOS mode"
I don't think so. grub-install would have selected the i386-pc target instead of x86_64-efi.
I booted knoppix with: secure boot=disable Under this knoppix I ran: grub-install. Should I boot the PC with secure boot=enable and then run grub-install ?
I do not think it would change anything. As I suggested previously, you'd rather check efivarfs first. If it cannot be mounted, run grub-install with option --force-extra-removable and select to boot from the drive removable media path (not the "debian" boot entry).
