Install NVIDIA driver on ubuntu

Automatic Install using standard Ubuntu Repository

Detect the nvidia model and the recommended driver

 $ ubuntu-drivers devices
== /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 ==
modalias : pci:v000010DEd00001180sv00001458sd0000353Cbc03sc00i00
vendor   : NVIDIA Corporation
model    : GK104 [GeForce GTX 680]
driver   : nvidia-304 - distro non-free
driver   : nvidia-340 - distro non-free
driver   : nvidia-384 - distro non-free recommended
driver   : xserver-xorg-video-nouveau - distro free builtin 

install recommended driver by running

$ sudo ubuntu-drivers autoinstall

rboot and check

the easiest way to check 

Settings -> Details -> about  

resource

How to install the NVIDIA drivers on Ubuntu 18.04 Bionic Beaver Linux