I tried to revert to previous checkpoint for Ubuntu Sever 20.4 under
Hyper-V. Revert was successful but later when I tried to upgrade
packages which were eventually already upgraded previous to Revert, then
I got this same problem while package upgrade in current snapshot.
And following this link
FWIW I encountered the same Operation not permitted error upgrading from
19.10 to 20.04, in a hyper-V VM
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https://bugs.launchpad.net/bugs/1874620
Title:
error: failed to register the EF
** Summary changed:
- GRUB crashed during istallation
+ error: failed to register the EFI boot entry: Operation not permitted.
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https://bugs.launchpad.net/bugs/1874620
Title:
error: fa