GNU/Linux Ubuntu 21.04 Installing Processing 3 – Quick-Start Guide
You are Welcome! The Step-by-Step Tutorial Shows You How to Install Processing 3.x in Ubuntu 21.04 Hirsute GNU/Linux Desktop.
And Processing 3 for Ubuntu 21.04 is a flexible Software Sketchbook and a Language for Learning How to Code within the context of the Visual Arts.
Especially relevant: the Installation of the Oracle Java Runtime is Required for Coding in Java with Processing 3 Sketches.
The Instructions, Commands and Descriptions for Install Processing on Ubuntu Guide give Focus only to the Essentials.

1. Launching Terminal
Open a Shell Terminal emulator window
(Press “Enter” to Execute Commands)
Contents
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