I had similar problem. It might be related to bug #728745 as I have the same graphic card - Nvidia Go 7300. I tried complete reinstall of system. It is not better: compiz is not starting at all (both Unity and Gnome Classic). It freezes system if I start is manually.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/773174 Title: Compiz frezes Desktop after upgrading from Maverick -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs