Looks like Nvidia will keep bothering me as long as I use linux…
After installing nvidia drivers on 14.04 with kernel 3.19, the computer would not boot!
The problem is, xserver-xorg-lts-vivid and the solution is replace it with xserver-xorg-lts-trusty.
Boot in recovery, enable networking, drop onto shell, and enter the following lines to magically fix the issue
sudo apt-get update
sudo apt-get remove --purge nvidia-* xserver* libcheese7
sudo apt-get install xserver-xorg-lts-trusty
sudo apt-get install nvidia-346 nvidia-settings nvidia-prime ubuntu-desktop
This is tested on Nvidia GTX650