I had a similar problem. Starting Beryl after installing nvidia legacy seemed to cause it.
** Attachment added: "crash report" http://librarian.launchpad.net/6871979/_usr_bin_glxinfo.1000.crash -- glxinfo crash https://launchpad.net/bugs/73866 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
