Comment 1 for bug 1936857

in later releases grub-install has stopped forking to call efibootmgr in favor of using an EFI library.

Does it return non-zero error code? because it should be ignoring failure to call efibootmgr. And otherwise grub installation was completed.

efibootmgr recommends has been added back in Debian, but not yet in Ubuntu. becuase in general it is useful. Previously the dependency was on the grub-efi-arm64-bin package Depends: efibootmgr which is not there in the binary copies.

Imho src:grub2 in xenial/bionic should depend on efibootmgr on amd64 & arm64, or we should add efibootmgr dep in the grub2-unsigned package.

Upgrades should not be affected, since efibootmgr will not be removed. But fresh installs are affected, like the newly respun cloud-image.