Ubuntu Install Nvidia Driver
For Ubuntu 12.04
sudo add-apt-repository ppa:bumblebee/stable
sudo apt-get update
sudo apt-get install bumblebee bumblebee-nvidia virtualgl linux-headers-generic
sudo reboot
For Ubuntu 14.04 and later
sudo apt-get install bumblebee bumblebee-nvidia primus linux-headers-generic
sudo reboot
https://wiki.ubuntu.com/Bumblebee#Installation