Installing Unity 2D

Open the terminal and type this PPA to get unity 2d working on your desktop with Ubuntu 10.10 or Ubuntu 11.04.

sudo add-apt-repository ppa:unity-2d-team/unity-2d-daily
sudo apt-get update
sudo apt-get install unity-2d

 After the installation, all you need to do is logout/reboot and when you reach ‘Login screen’, select to boot into ‘Unity 2D’ session rather than ‘Ubuntu Desktop’ session which is by-default selection. And thats it. You are now in Unity 2D without losing anything in your Gnome 2.32 desktop or Gnome 3.

Getting the Firefox button back in Ubuntu 11.04 with Unity

sudo apt-get remove firefox-globalmenu