Since your dist-upgrade logs also show that you had shim-signed 1.34.9.2 installed since September 23 and the problem only occurred for you after the upgrade on October 11, I'm provisionally marking this as a regression-update due to the apparent connection to shim-signed 1.37~18.04.2+1533136590.3beb971-0ubuntu1.
** Tags added: regression-update ** Also affects: shim-signed (Ubuntu Bionic) Importance: Undecided Status: New -- 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