I had Ubuntu running fine a few minutes ago, but then a sudden error caused the virtual machine to exit to Windows. When I rebooted, I got a shrunken, mostly blue screen with "Activites" at the top left, the date in the top center, and when I mouse around it highlights elements of the UI that are supposed to be there. But if I try to open any windows, nothing happens.
Edit:
Ok, I've pressed the meta key and I can search for programs to run. Here's what that looks like:
Clicking "Terminal" returns me to the same blank blue screen. Nothing happens.
Edit2:
I noticed on startup i get this:
Edit3:
I realize that restoring a backup is an option, but I'd still like to know what's going on when it's in this state, and if there's a possibility to fix it. Is this an issue with VirtualBox, or with Ubuntu? Is it recoverable? Should I just always rely on backups? Maybe this is an easy fix that I just don't have enough knowledge about to resolve. I'm a beginner to Ubuntu and running VMs.