I left my laptop on for 30 minutes, and when I came back there was an error message.
I clicked on the prompts that asked if I wanted to report the error, but after that I lost my sidebar and header bar. The only buttons left are those in my desktop. I can't do anything now, I can't even log out and shut down properly, unless I press on the power button.
I can open the ones on the desktop but I can't minimize and exit from them. I have tried turning the laptop off and on but the problem is still there. What can I do?
I'm using Ubuntu 14.04 LTS.