Comment 17 for bug 559111

Seems likely. Bug #554106 is probably the reason why you can't change back to metacity in Visual effects, and possibly why some (like me) didn't have the compiz package installed in the first place. I'm assuming here that Visual effects takes care of installing the compiz packages and that the deadlock prevents the packages from being installed. But if not then I'm clueless to as why I didn't have the packages installed.

I'm not sure if Visual effects comes preactivated in my case or not. I'm using Intel graphics, GMA4xxx something.