sudo apt-get install mesa-utils
sudo apt-get -y build-dep unity-2d
sudo add-apt-repository ppa:u2t/bleedingedge
sudo apt-get update
sudo apt-get -y install unity-2d-shell
That is it reboot and pick unity-2d when logging into Ubuntu.
If the ppa:u2t/bleedingedge does not work, add this file:
/etc/apt/sources.list.d/u2t-bleedingedge-precise.list
Then add these contents:
deb http://ppa.launchpad.net/u2t/bleedingedge/ubuntu precise main
deb-src http://ppa.launchpad.net/u2t/bleedingedge/ubuntu precise main
Save and close.