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Installing JDK on Ubuntu

 OpenJDK

To install Open JDK 11 LTS

sudo apt-get install openjdk-11-jdk

or 

sudo apt install default-jdk


Oracle JDK

For Oracle JDK you have to manually download from the Oracle JDK website and install it. PPA doesn't work well anymore.


Manage JAVA 

If you have multiple JDK on your machine, you can configure which version to be used using the following command by selecting one.

sudo update-alternatives --config java

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