Comment 8 for bug 197264

nvidia does not provide open source drivers for their nvidia cards so a restricted driver must be installed in order to gain the possibility to use compiz, however, it appears that installing the restricted driver from the LiveCD is not possible (it was possible in the past) but now jockey only show a empty list and does not give you the possibility to install the driver. The fact that you can't use compiz is caused by this bug.