Cannot install sun-java6-jdk

On google's page "Initializing a Build Environment"

I got this to install sun-java6-jdk, cause I have to compile android 4.0, and open-jdk cannot help me
$ Sudo add-apt-repository "deb http://archive.canonical.com/lucid partner"
$ Sudo apt-get update
$ Sudo apt-get install sun-java6-jdk
However, when I execute the lines above, I still cannot install sun-java.

The solutions lies lines below, that is:

$ Sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu hard main multiverse"
$ Sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu hard-updates main multiverse"
$ Sudo apt-get update

And then

You can
$ Sudo apt-get install sun-java6-jdk