Upgraded 19.10=>20.04lts beta with do-release-upgrade -d, today. Got two
times an ASCII window warning message like "grub failed to install. If
you continue, your system might not boot". Continued anyway and the
system still boots.
However, I can reproduce the error in console now via sudo grub-install -v
--target=x86_64-efi --recheck /dev/sda resulting in:
grub-install: (...)
grub-install: info: Registering with EFI: distributor = `ubuntu', path =
`\EFI\ubuntu\shimx64.efi', ESP at hostdisk//dev/sda,gpt1.
grub-install: warning: Internal error.
grub-install: error: failed to register the EFI boot entry: Operation not
permitted.
This post seems related and points to efivarfs:
https://unix.stackexchange.com/questions/379774/grub-installation-failed
The EFI firmware in my case is Hyper-V (WS2016 host).
Hope, this helps.
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https://bugs.launchpad.net/bugs/1872212
Title:
grub-install: Operation not permitted
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