I am/was affected by this bug (or at least the same symptoms) on a Dell XPS 13 9343. It got resolved by updating the BIOS from version A15 to version A20. I got the idea from reading the comments at https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1753518, which may be related to this.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1855574 Title: grub-efi-amd64-signed (1.93.15+2.02-2ubuntu8.14) failed to upgrade, system unbootable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1855574/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
