While loging in I chosed "Ubuntu" but when launch My Unity receive message "Ubuntu running in 2D mode..." and some options in compizConfig are disabled. I am instaled ati radeon proprietary driver and now it's activeted but when try to install post released updates then be a problem with installation and can't activate it. ...and i can't launch Ctalyst Control Centre (as one of the reasons stated- the AMD driver is not functioning properly.)...and still can't switch to Ubuntu 3d.
Run "Additional Driver" from application menu and install the one "recommended" then reboot.It should work for you.If you still stuck, edit your post.