Add the partner repository
sudo add-apt-repository "deb http://ir.archive.ubuntu.com/ubuntu jaunty-updates main multiverse"
Resynchronize the package index files
sudo apt-get update
Install Sun JDK 5
sudo apt-get install sun-java5-jdk
sudo add-apt-repository "deb http://ir.archive.ubuntu.com/ubuntu jaunty-updates main multiverse"
sudo apt-get update
sudo apt-get install sun-java5-jdk
This no longer works. I think the jaunty archives are gone.