ubuntu10.10 later install jdk6

sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner"

add-apt-repository ppa:ferramroberto/java

sudo apt-get update 

sudo apt-get install sun-java6-jdk

之後需要設置默認的java程序sudo update-alternatives ——config java按照提示輸入對應的選項，指定爲JDK6

success...