sudo apt-get install openjdk-8-jdk
sudo update-alternatives --config java
Auswahl Pfad Priorität Status 0/usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 automatischer Modus 1 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manueller Modus * 2 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manueller Modus
https://www.curseforge.com/minecraft/modpacks/all-the-mods-3/files
sudo java -Xms3GB -Xmx7500MB -jar forge-1.12.2-123.5.2838-universal.jar nogui