[SOLVED] After upgrade of debian 9 to 10 vm does not boot anymore ....

[apax]

I have upgraded debian from v9 (strech) to v10 (buster) and the vm is stuck in "grub rescue" after reboot, with the error message "symbol grub_is_lockdown not found" (see fig 1)

I can manually start by pressing F2 and then go in "boot maintenance Manager" and manually "Boot From File" and selecting 'EFI' - '<debian>' - 'grub64.efi' (see fig 2). However It is a nuisance having these extra steps as the VM will not restart automatically after a host restart.

- I have tried to define a new entry in the boot managed that points to that file unsucessfully as it is lost on reboot.
- I have also tried:

$ blkid
/dev/vda1: UUID="7686-0031" TYPE="vfat" PARTUUID="067f9d69-0838-4273-86de-d216da223352"
/dev/vda2: UUID="c3cdd3b5-26e5-466a-be1e-cda021bb9a41" TYPE="ext4" PARTUUID="e5891b6c-01d3-409a-9dce-84f8f9511a84"
/dev/vda3: UUID="d342f45a-c040-4307-8b73-be5bc75f2060" TYPE="swap" PARTUUID="e610e68a-b38b-4916-ab5e-73cb27518e36"
$ grub-install /dev/vda
Installing for x86_64-efi platform.
Installation finished. No error reported.
$ update-grub
Generating grub configuration file ...
Found background image: /usr/share/images/desktop-base/desktop-grub.png
Found linux image: /boot/vmlinuz-4.19.0-18-amd64
Found initrd image: /boot/initrd.img-4.19.0-18-amd64
Found linux image: /boot/vmlinuz-4.9.0-17-amd64
Found initrd image: /boot/initrd.img-4.9.0-17-amd64
Adding boot menu entry for EFI firmware configuration
done

but, after the VM reboots I am always stuck in fig 1.

Could someone help me with a suggestion ?

Many thank ! -- albpacecom


Fig 1


Fig 2

 

[gurubert]

Have you switched the VM from BIOS to UEFI or vice versa?

 

[apax]

gurubert, thank for the reply.

By following your advice, I realized that my VM configuration was missing the EFI disk that was necessary to persist the changes. After adding it, and pressing F2 at boot I was able to add the default EFI boot file and persist it at the next boot.

- apax