Thanks @sihui
so I’ve done
su - use sudo su:
sudo su
echo “deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main” | tee /etc/apt/sources.list.d/webupd8team-java.list
echo “deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main” | tee -a /etc/apt/sources.list.d/webupd8team-java.list
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
apt-get update
apt-get install oracle-java8-installer
Exit
Java Version
java version "1.8.0_101"
Java™ SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot™ Client VM (build 25.101-b13, mixed mode)
and it is 