Step-by-step – Nvidia Driver 340 Ubuntu 16.04 Installation

Installing

2. 2. Setting Up NVIDIA Driver Repo

   How to Add NVIDIA Graphics and GPU Drivers Linux Ubuntu PPA Repo

   Adding NVIDIA PPA

   GNU/Linux Ubuntu 16.04 NVIDIA PPA Setup

   Possibly now see How to Check NVIDIA Graphics Card Model Supported Drivers.

3. 2. Installing NVIDIA 340 Driver

   Then to Install NVIDIA 340xx Driver
   Simply play:

   sudo apt install nvidia-340 nvidia-settings

   And in case of Issue try instead with the more powerful aptitude Package Installer.
   So first, to Install Aptitude run:

   sudo apt install aptitude

   And next try the Setup again playing:

   sudo aptitude install nvidia-340 nvidia-settings

   Last, to Load your barely New Graphics Driver Reboot with:

   sudo reboot