Comment 63 for bug 1220426

The latest driver from nvidia which seems to be the superset of supported drivers as 331.89 is 340.24.
Using this new driver I have not yet had a freeze. Will follow up tonight if issue is resolved.

Install from this source: http://linuxg.net/how-to-install-the-nvidia-340-24-driver-on-ubuntu-14-04-ubuntu-13-10-ubuntu-12-04-and-derivative-systems/

I attempted a manual install from nvidia first by downloading the driver here: http://www.nvidia.com/download/driverResults.aspx/76884/en-us

I was able to get the driver to install (manual installation) however had low graphics issues and could not get the unity launcher to show, no tool bar and the right click didn't work either. After reverting my system and installing the PPA worked perfectly. I strongly recommend using the PPA (fist link over manual installation).

Ensure that this PPA supports your graphics by checking the nvida link.