deb http://us.archive.ubuntu.com/ubuntu/ hardy multiverse
但是当执行
sudo apt-get update
还会出现 W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/jaunty/universe/binary-i386/Packages
404 Not Found [IP: 91.189.92.180 80]
这个时候，需要将(xx.)archive.ubuntu.com t改成 old-releases.ubuntu.com.
deb http://old-releases.ubuntu.com/ubuntu/ hardy multiverse
再
sudo apt-get update
然后
sudo apt-get install sun-java6-jdk