How to uninstall or remove default-jre-headless software package from Ubuntu 16.04 LTS (Xenial Xerus)

You can uninstall or removes an installed default-jre-headless package itself from Ubuntu 16.04 LTS (Xenial Xerus) through the terminal,

$ sudo apt-get remove default-jre-headless

Uninstall default-jre-headless including dependent package

If you would like to remove default-jre-headless and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove default-jre-headless

Use Purging default-jre-headless

If you use with purge options to default-jre-headless package all the configuration and dependent packages will be removed.

$ sudo apt-get purge default-jre-headless

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove default-jre-headless