Ubuntu decided to drop Sun Java from the latest release of Ubuntu, Lucid Lynx. However for me to get my internet bank to work, I need this package installed. A bit of googling turned up the solution, and here it is:
Add the Canonical Partner Repository:
sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner"
Then all you need to do is run the commands:
sudo apt-get update sudo apt-get install sun-java6-jre sun-java6-plugin
And there it is 
