Comment 5 for bug 125358

Dan:
Since you are no longer using drivers supported by Ubuntu your support options change (this is mentioned on https://help.ubuntu.com/community/BinaryDriverHowto/Nvidia ):

Any problems that occur after installing drivers not provided by Ubuntu repositories should not be reported to the launchpad bug area. If the drivers were downloaded from the NVIDIA web site then the NVIDIA Linux web forum ( http://www.nvnews.net/vbulletin/forumdisplay.php?f=14 ) is an appropriate place to report issues. If a 3rd party installer was used please contact the 3rd party for support. Other places for manual driver support can be found on the Community Support page ( http://www.ubuntu.com/support/communitysupport ).