I have recently noticed that for some reason when pressing CTRL in a VM in VirtualBox it doesn't get through... So I can't easily copy and paste etc, it just doesn't get through, the VM doesn't think that I've pressed anything when I press CTRL or at least it doesn't do anything, why is this? It doesn't seem to matter what I run as guest, and it didn't happen before with these same VMs so it's not that they all just don't like it, the problem probably is with VirtualBox. I have tried running Ubuntu GNOME 15.10, Ubuntu 16.04, and Ubuntu GNOME 16.04.
Neither the left, nor the right CTRL keys actually do anything, they don't even seem to interact with Virtual Box because pressing the right one should change something in it.
I have tried installing the Guest Additions CD in my VMs, but it makes no difference to my problem.
No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 15.10 Release: 15.10 Codename: wily Flavour: GNOME GNOME Version: 3.18
Version: 5.0.14 r105127