Use the linux-restricted-modules alligned with your kernel. If you build from nvidia-kernel-source (that is not supported) you need to manually update the module.
** Changed in: linux-restricted-modules-2.6.19 (Ubuntu) Status: Unconfirmed => Rejected -- source version is different from nvidia xserver https://launchpad.net/bugs/70835 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs