I also had this problem when switching over to Nvidia drivers. The problem was that one package required interaction from the user.
Killing the update/install and running sudo dpkg --configure -a to finish it through command line worked. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1580217 Title: shim-signed only half-configured following ubuntu upgrade to 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1580217/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
