[ubuntu] Install Sun Java

Hi ALl

Some day before, I install sun-java. But have below error.
How to fix ?
Each time update my system. Following error prompted.

Ubuntu Release 8.04

This package is an installer package, it does not actually contain the
J2SDK documentation. You will need to go download one of the
archives:

jdk-1_5_0-doc.zip jdk-1_5_0-doc-ja.zip

(choose the non-update version if this is the first installation).
Please visit

http://java.sun.com/j2se/1.5.0/download.html

now and download. The file should be owned by root.root and be copied
to /tmp.

[Press RETURN to try again, 'no' + RETURN to abort]