Hello Everyone,
I found this to be the easiest way to download and install the latest version update of the Arduino IDE, and to also add it to the "panel" in Linux Mint 21.
To download an update of Arduino IDE go to https://www.arduino.cc/en/software and download the latest "AppImage" for Linux, which was arduino-ide_2.3.0_Linux_64bit.AppImage at the time of this post.
Open a terminal, ctrl alt t, and cd to the Downloads folder and find the downloaded file, arduino-ide_2.3.0_Linux_64bit.AppImage.
Make it executable by typing chmod +x arduino-ide_2.3.0_Linux_64bit.AppImage, next go to Files, Downloads folder, and double click on the arduino-ide_2.3.0_Linux_64bit.AppImage file.
Now to add the IDE to the panel go to the desktop "not the folder the actual Desktop", then right-click on the desktop and select "Create a New Launcher here".
Follow the prompts. Give it a name, Arduin0 2.3.0 and then browse to the app /home/john/Downloads/arduino-ide_2.3.0_Linux_64bit.AppImage. Answer "yes" to the dialog box "Would you like to add this launcher to the menu also? It will be placed in the other category initially" Done.
Then go to Menu "the very left side of the panel" and click on "All Applications" Find Arduin0 2.3.0 right click on it and select "add to panel". Done.
Hope this helps someone