use Nvidia GTX 860M with 14.04

This is an answer in askubuntu, How do I use Nvidia GTX 860M with 14.04?

The 860M card is supported by nVidia's proprietary drivers.

You can install them pretty quickly and easily. It just looks scary.

1. Download the appropriate driver from nVidia's webpage. It saves a .run file.
2. Change to console mode with alt+ctrl+F2, log in and then navigate to your Downloads folder with cd ~/Downloads
3. Type chmod +x NVIDAFILENAMEHERE.run and then press enter
4. Type sudo service lightdm stop and then hit enter
5. Type ./NVIDAFILENAMEHERE.run and then press enter
6. Follow the prompts on screen to install the drivers.