I have the same problem on Dell Latitude E5450. It is very unlikely firmware issue because
a) there was zero problems in 14.04 and 16.04. This started to happen only after update to 18.04. b) if I reboot system and run "dpkg --configure -a", the same process ends successfully. c) as seen in https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1787692 it affects multiple hardware models. Note that https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1787692 describes exactly the same problem, just hit during different package install. ** Changed in: shim-signed (Ubuntu) Status: Expired => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1767474 Title: Could not delete variable: Invalid argument (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/1767474/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
