Step-by-step NVIDIA Quadro P400 Ubuntu 18.04 Driver Setup – Step-by-step Guide
How to Install NVIDIA Quadro P400 Driver for Ubuntu 18.04 Bionic 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) -
2. Enabling NVIDIA Driver PPA
Add NVIDIA Graphics Drivers PPA for Ubuntu GNU/Linux
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