You didn't need to go to all that trouble. You can always find the latest NVIDIA driver in my PPA on Launchpad
. Just remove the Nvidia driver you manually installed (run the package with --uninstall), add my PPA to your repository list, and install the driver again with the non-free driver tool. Then, you will get all of the advantages of the DKMS system without having to use the old Nvidia driver packaged with Ubuntu.