I had this error on Ubuntu Mate 20.04, also when running grub-install chroot'ed to the failed installation. After converting the partition table from MBR to GPT, grub-install worked.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1874610 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/1874610/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
