In Ubuntu 21.10, we always install both the EFI and BIOS bootloaders to
disk, so that future changes to the system's firmware don't break
compatibility with the OS.
The upgrade failure indicates that, at some point after installation,
the partition that was used as the EFI System Partition has been
reformatted and is no longer recognized as one; but you did not remove
the EFI grub package from your system so it's still expected to be
there.
My recommendation would be to NOT remove the ESP that Ubuntu configured.
But if you don't want to restore it, then you need to remove the grub-
efi-amd64-signed package from your system instead.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1972035
Title:
installed grub-efi on bios install on upgrade from 21.10 to 22.04
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