Install Cairo Dock 3.1.1 in Ubuntu 12.04/12.10

Cairo-Dock is a pretty, light and convenient interface to your desktop, able to replace advantageously your system panel! It features multi-docks, taskbar, launchers and a lot of useful applets. Applets can be detached from the dock to act as desktop widgets. Numerous ready-to-use themes are available in 1 click, and can be easily customized at your convenience. It can use hardware acceleration