This page explains how to install Arduino IDE 2.0.0 Ubuntu 20.04. The following has been performed with the following versions:
Note that you can install the Arduino IDE from Ubuntu Software, but this is not the last version (1.8.19 while the last version is 2.0.0). Arduino IDE can also be installed with the AppImage, but its integration in Ubuntu is not nice. For example, adding the app in your launcher is not easy.
First, download the Zip file from the Arduino official website.
Open a terminal in the folder where the Zip file has been download. Unzip the file with the following command:
unzip arduino-ide_2.0.0_Linux_64bit.zip
Create a folder in home directory to put the Arduino IDE files:
mkdir ~/arduino
Copy the files extracted previously in the folder:
cp -r arduino-ide_2.0.0_Linux_64bit/* ~/arduino/
Go to the installation folder:
cd ~/arduino
Launch the Arduino IDE with the following command:
./arduino-ide
The IDE should open.

To add the Arduino IDE to the launcher, create a new file arduino.desktop
in the folder ~/.local/share/applications. Bellow is the content of the file,
don't forget to update the fields Icon and Exec according to your installation:
[Desktop Entry]
Version=1.0
Type=Application
Name=Arduino IDE 2.0.0
Icon=/home/username/arduino-ide-2/ide-logo.png
Exec=/home/username/arduino-ide-2/arduino-ide
Comment=The Arduino Software IDE
Categories=Development;IDE;
Terminal=false
