Thanks fibres - I've committed update #24871 which updated all the PCI IDs for nvidia for lucid, this included yours as well! What i found odd is that your PCI ID didn't show up under 173 or 96 but did show up under the 260, so the next time the script is invoked for you it will work.
At this point you have a couple of options to get the updated file:
1. wait for the next package compile, which lately has been once every day or so
2. download the file directly with the command: wget http://svn.linuxmce.org/svn/branches/LinuxMCE-1004/src/BootScripts/nvidia-install.sh
Since the file has no other dependencies that could hork up and the change was so minimal it shouldn't be a big deal to download it directly, just make sure if you do option 2 you replace the existing file in /usr/pluto/bin/ with the proper permissions. -rwxr-xr-x (wget downloads items as non-executable, so do a chmod +x /usr/pluto/bin/nvidia-install.sh after downloading and placing the file).
Then undo any comments you did for the init scripts and retest!