sudo add-apt-repository ppa:webupd8team/java

vi /etc/apt/sources.list.d/webupd8team-java-wheezy.list

deb http://ppa.launchpad.net/webupd8team/java/ubuntu precise main
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu precise main

apt-get update

apt-get install oracle-java8-installer oracle-java8-set-default

apt-get remove openjdk-*-jre