How do I use desktop effects in Ubuntu 11.04
closed as too localized by Marco Ceppi♦ Aug 16 '12 at 14:29
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You'll need to provide more information about your computer in order for a fuller answer, but I'll do my best to help.
If you are seeing the new Unity interface then your computer is capable of 3D compositing effects but they are not toggled via the menu previously available in the Appearance menu.
If you want to change which effects are in use, you should install the CCSM by typing
If you are not seeing the Unity interface and are being forced into the Classic Desktop (with the old GNOME Panels) then your computer may not be capable of running Compiz or you may have to install proprietary graphics drivers.