This bug also affecting me, after upgrade the server is in reboot loop
because first kernel is crashing or does not exist, I must select
manually other kernel. After each upgrade there is same error that grub
cant be upgraded.

Installing grub to /boot/efi.
Installing for x86_64-efi platform.
grub-install: warning: Internal error.
grub-install: error: failed to register the EFI boot entry: Operation not 
permitted.
Installing grub to /boot/efi.
Installing for x86_64-efi platform.
Installation finished. No error reported.

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

Title:
  grub-install: Operation not permitted

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