Install default-jdk on Ubuntu: sudo apt-get install default-jdk

Quick installation of default-jdk:

Step 1: Update system:

sudo apt-get update

Step 2: Install: default-jdk

Ater updaing the OS run following command to install the packae:

sudo apt-get install default-jdk

How to install default-jdk on Ubuntu 12.04 LTS?

First of all update your system with the command:

sudo apt-get update

Above command will download the package lists for Ubuntu 12.04 LTS on your system. This will update the list of newest versions of packages and its dependencies on your system.

After downloading the latest package list with the help of above you can run the installation process.

If default-jdk is not installed on your compter then the command 'dpkg -L default-jdk' will give followin error.

deepak@deepak-VirtualBox:~$ dpkg -L default-jdk
Package `default-jdk' is not installed.
Use dpkg --info (= dpkg-deb --info) to examine archive files,
and dpkg --contents (= dpkg-deb --contents) to list their contents.
deepak@deepak-VirtualBox:~$ 

Installing default-jdk:

After system update use the following command to install default-jdk:

sudo apt-get install default-jdk

Above command will confirm before installing the package on your Ubuntu 12.04 LTS Operating System. If you are not already logged in as su, installer will ask you the root password. After completion of the installation you can use the package on your system.

How to uninstall/remove default-jdk from Ubuntu 12.04 LTS?

Now we will see the commands for uninstalling the default-jdk from Ubuntu 12.04 LTS. For uninstalling this package you can easily use the apt command and remove the package from Linux Operating System.

To remove the default-jdk following command is used:

sudo apt-get remove  default-jdk

Following command is used to remove the default-jdk package along with its dependencies:

sudo apt-get remove --auto-remove default-jdk

This will remove default-jdk and all its dependent packages which is no longer needed in the system.

Completely removing default-jdk with all configuration files:

Following command should be used with care as it deletes all the configuration files and data:

sudo apt-get purge default-jdk

or you can use following command also:

sudo apt-get purge --auto-remove default-jdk

Above command will remove all the configuration files and data associated with default-jdk package. You can can't recover the delete data, so, use this command with care.