This is reported as an upgrade of the shim-signed package; you previously had shim-signed 1.33.1~17.10.1+13-0ubuntu2 installed from Ubuntu 17.10, and are upgrading to version 1.34.9+13-0ubuntu2 in Ubuntu 18.04. But the errors in your report show that the system has no /boot/efi partition mounted, and efibootmgr does not detect this as a UEFI system. Why did you have the shim-signed package installed?
** Changed in: shim-signed (Ubuntu) Status: New => Incomplete ** Summary changed: - package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1 + (non-UEFI, present before upgarde) package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1772834 Title: (non-UEFI, present before upgarde) package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1772834/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs