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 solved the problem: https://unix.stackexchange.com/a/379824/241737 I think option "--target=x86_64-efi" in below command matters: grub-install -v --target=x86_64-efi --recheck /dev/sda -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1874620 Title: error: failed to register the EFI boot entry: Operation not permitted. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1874620/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
