Install NVIDIA GTX 980 TI Ubuntu 16.04
How to Install NVIDIA GTX 980 TI Ubuntu 16.04 Driver desktop.
The NVIDIA GTX 980 TI Ubuntu Driver Install is a breeze, requiring just a few straightforward Shell Commands to complete.
Finally, with nvidia-settings Tool you can configure Brightness, Gamma, XVideo attributes, Temperature, and OpenGL.

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Open a Terminal Shell emulator window
Ctrl+Alt+t on desktop
(Press “Enter” to Execute Commands) -
How to Install NVIDIA Ubuntu PPA Repo
First, possibly Check NVIDIA Graphics Card Model Supported Drivers.
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Finally, to Install NVIDIA Ubuntu Driver.
sudo apt install nvidia-driver-390 nvidia-settings