I have been using (or trying to use) Ubuntu for a while now. I cannot for the life of me get any proprietary NVIDIA drivers to work in 12.04, 12.10 or 13.04. I've tried every method posted on these forums and the wider internet to no avail.
The closest that I have gotten is by following this guide: http://falkvinge.net/2013/02/15/how-to-install-nvidia-drivers-in-ubuntu-12-10-quantal/ which manages to actually install NVIDIA drivers but results in a lack of unity when logging into the system, as well as constant system error messages. This is in 13.04, trying this method in 12.10 just stops Ubuntu from booting at all.
I couldn't even get 12.04 to boot once installed, I was just faced with a blinking cursor that did nothing (I like to call this the cursor of death, I've seen it enough times now).
I'm using a Packard Bell iXtreme Desktop with an NVIDIA GeForce GT610 that I have installed myself. If you require any logs to help then I will happily provide them to you as long as I can get to them through terminal.
Please help, I only have one workaround at the moment and it's called Windows!