I did the following steps yesterday on 12.10 64bit
with Nvidia 520GT and it worked for me but only on ubuntu
(I tried on cubuntu as well but I could not get ride from the nouveau error so I hope it will work with kubuntu)->
download nvidia binary form there website
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install build-essential linux-headers-$(uname -r)
sudo apt-get remove --purge nvidia*
sudo apt-get remove --purge xserver-xorg-video-nouveau
In the vim / gedit or any other text editor, I added the following lines to /etc/modprobe.d/blacklist.conf :
go to tty1 or any other terminal (not in x) and stop x
now run nvidia driver as root (sudo Nvidia-bla-bla...)
sudo service lightdm stop
and follow the instructions (I clicked yes on every option including chage my xorg setting).
I hope is some one can explain to me how can I make the driver to recompile on kernel update. I just had an update to day and had to manually download the new kernel headers and run the nvidia driver again. the thing is its a bunch of computers we use at work and I don't want to go and manually install the drivers again on every kernel update.