neuronical.com

As it turns out the 185.18.14 driver that you download from NVidia doesn't work with Ubuntu 9.10, or in fact, any system running a 2.3.1 kernel. Fortunately a patch is available. Basically once you have downloaded the driver at http://www.nvidia.com you ALSO need this patch: http://www.neuronical.com/sites/default/files/nvidia-185.18.14.patch

(No I didn't make that patch. Found it at http://www.nvnews.net/vbulletin/showpost.php?p=2033988&postcount=3)

Place both the install file and the patch in the same directory. Then run the installer with the --apply-patch option like so: