I keep ubuntu up-to-date. I turned on my computer today and It was slow to boot, only reponding after I moved my mouse a bit. Then it got to the screen with an error message but the error message didn't have a title bar/header. There was no taskbar. I couldn't pull up the left bar or open unity from the super key. I couldn't open the terminal from ctrl-alt-t. The only thing I could do was do ctrl-alt-delete. The task manager pulled up in the top left of the screen without a title bar. My CPU usage was erratic and wildly fluctuating. Ram was steady. I noticed a bump in my network usage. What should I do?