Install Java use PPA
- install for apt-add-repository command
sudo apt-get install python-software-properties
- then install java
sudo apt-add-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
- set java environment path
export JAVA_HOME=/usr/lib/jvm/java-8-oracle/
export PATH=${PATH}:${JAVA_HOME}/bin
Reference: http://askubuntu.com/questions/521145/how-to-install-oracle-java-on-ubuntu-14-04