Download this file and then type in a terminal:
sudo dpkg -i jpafboard_2.5_amd64.deb
If you want to uninstall it, just run:
sudo apt remove jpafboard
Download this file, open it and follow the instructions.
If it does not work, please check that you have downloaded the correct files for your operating system.
You may as well try the open with command and check that the jar file is correctly opened with Java 17.
If it still doesn't work, please drop me an email