tux@earth:~$ sudo sh -c 'echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" >/etc/apt/sources.list.d/webupd8team-java.list'
tux@earth:~$ sudo sh -c 'apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886'
tux@earth:~$ sudo apt-get update
tux@earth:~$ sudo apt-get install oracle-java8-installer
tux@earth:~$ sudo apt-get install oracle-java8-set-default
tux@earth:~$ java -version
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)
Dokumentation