This just happened to me during a "routine" upgrade of a 20.04 system.
Setting up grub-efi-amd64-signed (1.142.9+2.04-1ubuntu26.7) ...
Installing grub to /boot/efi.
Installing for x86_64-efi platform.
A window pops up:
GRUB failed to install to the following devices:
/dev/nvme0n1p1
Do you want to continue anyway? If you do, your computer may not start up
properly.
Writing GRUB to boot device failed - continue?
(saying "no" just loops back to the same screen)
grub-install: warning: Internal error.
grub-install: error: failed to register the EFI boot entry: Operation not
permitted.
This is the last info line before the error when manually running grub-
install:
grub-install: info: Registering with EFI: distributor = `ubuntu', path =
`\EFI\ubuntu\shimx64.efi', ESP at hostdisk//dev/nvme0n1,gpt1.
No idea what to expect when I reboot.
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https://bugs.launchpad.net/bugs/1872212
Title:
grub-install: Operation not permitted
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