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

[RB]

Had the same error message installing Ubuntu 20.04.1.  Following Alexei
Lozovsky's advice above, I made my EFI partition the first partition on
the disk, and also made it a primary partition as opposed to a Logical
partition within an extended partition, and the installation completed
successfully.  (My disk is still MBR partitioned, but I am using UEFI).

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https://bugs.launchpad.net/bugs/1872212

Title:
  grub-install: Operation not permitted

Status in grub2-signed package in Ubuntu:
  Confirmed

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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