My Ubuntu is almost unuseable right now. the top and left bars disappeared and the keyboard shortcuts are not working. I am running Ubuntu 14. By opening a folder from the desktop I am able to navigate trough the file system.
The OS showed some problems before I restarted it. I installed Oracle VirtualBox, but it disappeared. Then the Software Center disappeared too.
I can still open applications, but I can't move some of them around the screen.
Is there anything I can do about that, or I shall reinstall the OS?