install sun java on ubuntu 10.04

Sun Java moved to the Partner repository

For Ubuntu 10.04 LTS, the sun-java6 packages have been dropped from the Multiverse section of the Ubuntu archive. It is recommended that you use openjdk-6 instead.

If you can not switch from the proprietary Sun JDK/JRE to OpenJDK, you can install sun-java6 packages from the Canonical Partner Repository. You can configure your system to use this repository via command-line:

$> add-apt-repository "deb http://archive.canonical.com/ lucid partner"
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and then：
$> sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner"
$> sudo apt-get update
$> sudo apt-get install sun-java6-jdk