在ubuntu10.04版本里面，sun的jdk已經不是在標準庫里面，標準庫的只有openJDK了，sun的jdk已經被放到partner庫里面，所以如果要安裝jdk，需要以下步驟：
To enable Partner Repo:
SYSTEM -> ADMINISTRATION -> SOFTWARE SOURCES -> OTHER SOFTWARE
-> ADD
deb
http://archive.canonical.com/
lucid partner
Then CLOSE window and RELOAD, then search for Sun Java
You should find Version 6.20 ..... Install