By default Ubuntu 10.10 (32-bit) installs OpenJDK for JRE, JDK. Since OpenJDK tries to replace the properietry pieces of Sun-JDK, this is a nice project, however, there is still time before it grasps all the specs and works flawlessly.

Before we begin, type: java -version, at the command prompt, and you will see that the version is a Open-JDK version.

To Replace Sun-JDK with Open-JDK follow the setps below:

1. Enable partner repositories :  

  - Open  System -> Administration -> Synaptics Package Manager

 - In the Package Manager > Settings menu > Repositories, and check the box for Software restricted by copyright or legal issues

2. Install Sun-JDK

sudo apt-get install sun-java6-jdk sun-java6-jre sun-java6-source sun-java6-fonts sun-java6-bin sun-java6-plugin

3. Replace OpenJDK with SunJDK

sudo update-java-alternatives -v -s java-6-sun

To Double check, type: java -version, and you should see the Sun-Java version details.