mousepad /etc/default/grub; update-grub; echo "deb http://ftp.de.debian.org/debian jessie-backports main" >> /etc/apt/sources.list;apt-get update;apt-get install openjdk-8-jdk libopenjfx-java; dpkg -i Downloads/Greenfoot-linux-303.deb
mousepad /etc/default/grub; update-grub; echo "deb http://ftp.de.debian.org/debian jessie-backports main" >> /etc/apt/sources.list;apt-get update;apt-get install openjdk-8-jdk libopenjfx-java; dpkg -i Downloads/Greenfoot-linux-303.deb