Install Java from Oracle Java website clicking on Free Java Download. Make sure you download at least Version 8.
Run pattypan by double-click pattypan.jar.
Install Java
sudo apt-get install openjdk-8-jdk
sudo apt-get install openjfx
Run pattypan by typing in Terminal: java -jar pattypan.jar or double-click selecting option allowing run as a program before:
