Sun Java6 JDK has No Installation Candidate

http://codingexplorer.wordpress.com/2010/10/08/sun-java6-jdk-has-no-installation-candidate-on-ubuntu-10-04/

You can resolve the problem by performing either of the following steps:

• Install the OpenJDK
  yee@chimney:~$ sudo apt-get install openjdk-6-jdk
• Install sun-java6 packages from the Canonical Partner Repository
1. Adding a new source
   sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner"

2. Run an update for the new repository
   sudo apt-get update
3. Now you can install the Sun JDK
   sudo apt-get install sun-java6-jdk
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