Try `dpkg-reconfigure grub-efi-amd64` and select the correct disk Ubuntu is installed on when asked.
This is either a case of the installation having been moved to a different disk, or possibly a case of https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/2083176 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2118823 Title: package grub-efi-amd64 2.12-1ubuntu7.3 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/2118823/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
