Question: how install jdk 8 on ubuntu?
Answer: Check which version of the JDK your system is using: java -version. ...  Update the repositories: sudo apt-get update. Install OpenJDK: sudo apt-get install openjdk-8-jdk. ...  Verify the version of the JDK: ...  If the correct version of Java is not being used, use the alternatives command to switch it: ...  Verify the version of the JDK: