You can install compiz and enable 3D desktop on your ubuntu by the following steps...
Install Compiz fusion
Just type this command in a terminal window:
sudo apt-get install compiz*
Enable 3D desktop
Right click on your desktop and select Change Desktop Background.
Go to Visual Effects tab and tick Extra on.
Now,go to System–>Preferences–>CompizConfig Settings Manager
Done.Press Ctrl+Alt and drag left mouse key,you will see::))))
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