I had to install headers first with 12.10. then the updates for nVidia worked.
http://ubuntuforums.org/showthread.php?t=2081649
# You may need headers - meta package for current version:
sudo apt-get install linux-headers-generic
# only reason to purge is there are several versions, if you know you have different nVidia use that:
#To see available versions:
apt-cache search nvidia-sett*
# I used nvidia-current-updates & nvidia-settings-updates, example below is just nvidia-current, use version you prefer
sudo apt-get purge nvidia*
sudo apt-get install nvidia-current
sudo apt-get install nvidia-settings
sudo dpkg-reconfigure nvidia-current
sudo nvidia-xconfig
sudo reboot
May want nvidia-current, nvidia-current-updates or nvidia-current-experimental-XXX for most recent testing version.
apt-cache search nvidia-sett*
Fix for nVidia with 12.10 missing kernel dpkg reconfigure:
http://ubuntuforums.org/showthread.php?t=2072862
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