I tried this:
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
http://askubuntu.com/questions/301484/how-do-i-update-ubuntu-manually
Error:
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
sudo dpkg --configure -a
http://askubuntu.com/questions/163200/e-dpkg-was-interrupted-run-sudo-dpkg-configure-a
Java:
sudo apt-get install --reinstall openjdk-8-jre
http://www.minecraftforum.net/forums/support/unmodified-minecraft-client/1860989-computer-freezes-ubuntu
Remove Java 7 JRE:
sudo apt-get remove openjdk-7-jre
I didn't try LWJGL - Lightweight Java Game Library , but I found in the Ubuntu Software Center