Installation for Linux Ubuntu will be described here.
Download Arduino IDE from the following page:
Unpack the file: arduino-1.8.10-linux64.tar.xz.
Run the installation script as root, sudo. wait until you see the message
$ sudo ./install.sh
Adding desktop shortcut, menu item and file associations for Arduino IDE…
The Arduino IDE should now be installed. Start icon shows here.
By default, the Arduino IDE starts with a sample program shown in the image here.