Unity 2D’s main goal is to provide a Unity environment on hardware platforms that don’t support Unity’s Open GL requirements. Many ARM platforms fall into this category, so Unity 2D expands Unity’s goodness to a whole new set of platforms.
The software is implemented using Qt/QML for the UI portions of Unity, while utilizing the existing Unity core components, like indicators, bamf, dee, uTouch and places.
Install ubuntu unity 2D using PPA in ubuntu 11.04/10.10
Open the terminal and run the following commands
sudo add-apt-repository ppa:unity-2d-team/unity-2d-daily
sudo apt-get update
sudo apt-get install unity-qt-default-settings
Now you have to select Unity Qt at the login screen
Unity 2D Demo Video