I have marked this a regression-update since the behavior was introduced on bionic in SRU via grub2 2.02-2ubuntu8.3 post-release, and impacts all upgrades from xenial to bionic for secureboot-enabled systems.
** Tags added: regression-update -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1788727 Title: upgrade crashing due to unsigned kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1788727/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs