Step-by-step NVIDIA Quadro P400 Ubuntu 16.04 Driver Setup
How to Install NVIDIA Quadro P400 Driver for Ubuntu 16.04 Xenial LTS GNU/Linux – Step by step Tutorial.
And the NVIDIA Quadro P400 Ubuntu Setup is done by Enabling the NVIDIA Driver Ubuntu PPA Repository.
Finally, before Installing it follow the Instructions on Searching the Newest Driver Release.

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1. Launching Shell Emulator
Open a Terminal window
Ctrl+Alt+t on desktop
(Press “Enter” to Execute Commands)
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