[Bug 1872212] Re: grub-install: Operation not permitted

[Michael.G.]

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

Status in grub2-signed package in Ubuntu:
  New

Bug description:
  I'm using Ubuntu 20.04 beta, upgraded from 19.10. 
  When doing the last upgrade I got an error message from grub.

  When I run ›dpkg-reconfigure shim-signed‹ I get this error:

  Installing for x86_64-efi platform.
  grub-install: warning: Internal error.
  grub-install: error: failed to register the EFI boot entry: Operation not permitted.

  Since then I didn't reboot, for I'm afraid it won't work.

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