Ok. Crucially, this shows that you have the 1.37~18.04.2+15+1533136590.3beb971-0ubuntu1 version of shim-signed installed, which was released on October 11 to bionic-updates; superseding version 1.34.9.2 which was there previously.
Why was the shim-signed package not installed? This is the package that \EFI\UBUNTU\SHIMX64.EFI is installed from, so for it to be absent suggests something was wrong with your upgrade process. Are you sure that the \EFI\UBUNTU\SHIMX64.EFI which was installed on your EFI System Partition at the time you encountered this problem was the one from shim-signed 1.37~18.04.2+15+1533136590.3beb971-0ubuntu1 ? (E.g.: if you disable CSM again now, does the problem reappear?) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1799767 Title: grub menu not showing with SecureBoot enabled after update To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1799767/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
