Comment 6 for bug 669174

The command made metacity the default window manager instead of compiz. Compiz is having difficulty getting along with intel video cards. As i thought, this is a duplicate of bug #664265

Hopefully they will be fixing it ASAP. Thanks for reporting. Marking as duplicate.

PS: To make the effect permanent you need to disable the "effects" in ubuntu. Otherwise you will have the same problem when you reboot the machine.

Right click the desktop> Change desktop background> Go to the visual effects tab and select none.