Enable Desktop Cube in Ubuntu 11.04

To enable Desktop Cube you must have Single-Row-Workspace. At the bottom right of the screen, right click on the Workspaces and select Preferences. Now change the number of Rows to 1 and Columns to 4.

Now go to System -> Preferences -> CompizConfig Settings Manager, Desktop tab. Disable (uncheck) Desktop Wall and Expo. Now enable Desktop Cube, and Rotate Cube.

Optional : You can enable 3D Windows in Effects tab if you want to.

Note : You can have a Pentagon or a hexagon, etc by changing the Number of Columns to 5 or 6, etc in the workspace preferences