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How to install the JDK on Ubuntu Linux

Note: This is an old question and the answers reflect the world as it was then. Modern Ubuntu distributions have OpenJDK available which can be installed with

sudo apt install default-jdk

I am trying to install the Java Development Kit (JDK) on Ubuntu Linux distribution, but I am unable to install it.

What are the steps to install it on Ubuntu?

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Answer

Referring to Ask Ubuntu question How to set JAVA_HOME for OpenJDK?,

How to install Open JDK (Java developement kit) in Ubuntu (Linux)?

  1. Open Terminal from Application Dash or press Ctrl+Alt+T

  2. Update repository:

    sudo add-apt-repository ppa:openjdk-r/ppa  # only Ubuntu 17.4 and earlier
sudo apt update

  3. Optional: To search available distributions of openjdk, use the following command:

    apt search openjdk

  4. Install the appropriate version with the following command:

    sudo apt install openjdk-8-jdk
sudo apt install openjdk-8-source #this is optional, the jdk source code

  5. For JAVA_HOME (Environment Variable) type command as shown below, in “Terminal” using your installation path…

    export JAVA_HOME=/usr/lib/jvm/java-8-openjdk

    (Note: /usr/lib/jvm/java-8-openjdk is symbolically used here just for demostration. You should use your path as per your installation.)

  6. For PATH (Environment Variable) type command as shown below, in Terminal:

    export PATH=$PATH:$JAVA_HOME/bin

  7. To check your installation:

    java -version

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