How to install JDK8 on Ubuntu 16?
Solution 1:
Usually you install the openjdk like this:
sudo apt-get install openjdk-8-jdk
Maybe this is the problem. You can look this up at http://openjdk.java.net/install/index.html. If you do this you might have fixed this problem. But cant imagine why your command give this result.
Solution 2:
I installed oracle-jdk8. If you need,
sudo add-apt-repository ppa:webupd8team/java && sudo apt update
sudo apt install oracle-java8-installer