To install Ambiance square on ubuntu 12.04
1.Open Terminal.To open terminal click the Dash home from unity launcher.And type terminal in the search field. And click Terminal.
2.Type the below code in terminal and hit enter.
sudo add-apt-repository ppa:kokoto-java/omgubuntu-stuff
3.Type your ubuntu password if needed.
4.Then press enter to continue or ctrl-c to cancel adding the ppa.
5.Type below command and hit enter
sudo apt-get update
6.Then type below command and press enter
sudo apt-get install square-ambiance-theme
To activate this theme in ubuntu install MyUnity
Open MyUnity and go to themes section.choose Ambiance square.