Install Java Plugin on Ubuntu Firefox

Current as of: 14 Sept, 2011

Versions
Ubuntu 'Natty' 11.04
Firefox 6.0.2
Sun Java6 Plugin

Add the 'universe' software source

1. Open the "Ubuntu Software Center"
2. In the menu, navigate to Edit > Software Sources...
3. (Enter administrator password)
4. Other Software > Add
5. Enter "deb http://archive.canonical.com/ubuntu natty universe" in the apt line
6. Click "Add Source"
7. Check that "Canonical Partners universe" entry has been added.
8. Click "Close"

Install the java6 plugin
Back in the "Ubuntu Software Center" window...

1. Navigate to "Get Software" and search for "sun-java6-plugin"
2. It should now return an entry for "sun-java6-plugin"
3. Click "Install"

It's that simple. Once complete, you should now be able to start/restart firefox and the java plugin will be installed.

You can optionally check, that the following symbolic link has been created.
/usr/lib/mozilla/plugins/libjavaplugin.so -> /etc/alternatives/mozilla-javaplugin.so