Step-by-step NVIDIA Quadro K420 Ubuntu 18.04 Driver Setup
How to Download and Install NVIDIA Quadro K420 Driver for Ubuntu 18.04 Bionic LTS GNU/Linux – Step by step Tutorial.
And the NVIDIA Quadro K420 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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