How to uninstall default-jdk from Ubuntu

Uninstall default-jdk

To uninstall just default-jdk package itself from Ubuntu execute on terminal:

sudo apt-get remove default-jdk

Uninstall default-jdk and it's dependent packages

To uninstall the default-jdk package and any other dependant package which are no longer needed on Ubuntu.

sudo apt-get autoremove default-jdk

Purging default-jdk

If you also want to delete configuration and/or data files of default-jdk from Ubuntu then this will work:

sudo apt-get purge default-jdk

To delete configuration and/or data files of default-jdk and it's dependencies from Ubuntu then execute:

sudo apt-get autoremove --purge default-jdk

default-jdk package information

name default-jdk
section devel
description

Standard Java or Java compatible Development Kit

website wiki.debian.org/ Java/ 
maintainer ubuntu-devel-discuss@lists.ubuntu.com

More information about apt-get remove

Advanced Package Tool, or APT, is a free software user interface that works with core libraries to handle the installation and removal of software on Debian, Ubuntu and other Linux distributions. APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of software packages, either from precompiled files or by compiling source code.

apt-get is the command-line tool for handling packages, and may be considered the user's "back-end" to other tools using the APT library.

apt-get remove is identical to install except that packages are removed instead of installed. Note that removing a package leaves its configuration files on the system. If a plus sign is appended to the package name (with no intervening space), the identified package will be installed instead of removed.

See Also

How to install default-jdk package on Ubuntu