Comment 3 for bug 1680283

You should be able to resolve this issue by running 'sudo apt -f install' from a terminal and following the prompts.

I notice that it appears you installed the virtualbox package from the commandline on 1 Apr; you should have already been prompted at that time to disable secureboot. Did you see the messages at that time? Did you deliberately choose not to disable secureboot? That leaves your system in an inconsistent state, where you have dkms module packages installed which cannot be used on a secureboot-enabled system, but you have not chosen to disable secureboot.