Ubuntu 18.04 Switch Node Js Version Guide
How to Install Node Version Manager and Switch Node Version on Ubuntu 18.04 Bionic LTS GNU/Linux desktop – Step by step Tutorial.
Moreover, Nvm Ubuntu 18.04 Installation guide includes instructions on How to Install NodeJS Versions on Ubuntu.

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