Naik wrote:do you have a hint, where to start?GRUB 1GRUB 2These have some pretty good basic and general information on the boot process, although the focus is on GRUB itself.
wolfcore wrote:Before rebooting, during the configuration of grub, I moved /boot/grub/ to /boot/efi/grub, because that was my efi-directory:Move back the directory to /boot/grub. /boot/efi/grubx64.efi is configured to look into /boot/grub (or rather <ESP>/grub, rather than <ESP>/efi/grub).
When Debian updated to GRUB 2 (package grub-pc), it didn't automatically upgrade the MBR. Instead it configured the old GRUB 1 installation so that it will chainload GRUB 2; that way administrators can test the new GRUB 2 configuration. If GRUB 2 failed for some reason, you still were able to boot the system with one of the old GRUB 1 entries.