So I recently "upgraded" from 10.04 LTS to 12.04 LTS. I am unable to see the close, maximize, and minimize buttons along the top of any open windows... additionally I can't even open a terminal!! I can only open XTERM although I cant choose where on the screen it appears and I cant move it around etc. Ive also tried terminator, ROXterm, Guake, nothing works...

Help!