tente este método
1.Faça o download do java
http://www.oracle.com/technetwork/java/javase/downloads/index.html
2.Open tipo de terminal commant
cd Downloads
tar xzvf jdk-8u45-linux-x64.tar.gz
sudo mkdir /usr/lib/jvm
sudo mv ~/Downloads/jdk1.8.0_45/ /usr/lib/jvm/
sudo chown -R root:root /usr/lib/jvm/jdk1.8.0_45
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0_45/bin/java" 0
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.8.0_45/bin/javac" 0
sudo update-alternatives --set java /usr/lib/jvm/jdk1.8.0_45/bin/java
sudo update-alternatives --set javac /usr/lib/jvm/jdk1.8.0_45/bin/javac
sudo gedit ~/.bashrc
export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_45
export PATH=$PATH:$JAVA_HOME/bin
. ~/.bashrc
java -version
echo $JAVA_HOME
echo $PATH