GNU/Linux Ubuntu 20.04 Installing Arduino IDE – Step by step Guide
How to Install Arduino IDE 2.0 Flatpak App in Ubuntu 20.04 Focal LTS GNU/Linux desktop.
And the Arduino Integrated Development Environment for Ubuntu Focal contains a Text Editor for Writing Code, a Message Area, a Text Console, a Toolbar with Buttons for Common Functions and a Series of Menus.
Moreover, it Connects to the Arduino and Genuino Hardware to Upload Programs and Communicate with them.
Especially relevant: also if Larger in Dimension the Flatpak App usually is truly Reliable and sometimes much easier to Setup than the traditional GNU/Linux App.
Finally, the guide includes detailed instructions on How to Getting Started with Arduino IDE.

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