I'm sure there is an easy fix for this, but after I upgraded from 12.10 to 13.04, Unity does not seem to be working. When I log in to the Gnome3 DE, everything seems fine, but when I log into the Unity DE, I have no top bar of side bar. Right-click also doesn't work. I can get a terminal emulator with Ctrl-Alt-T and Guake works fine with my F12 shortcut, but nothing works as far as the display. All I have is the wallpaper. I have taken all the updates.