Comment 2 for bug 402135

[code]
[Press RETURN to try again, 'no' + RETURN to abort]
This package is an installer package, it does not actually contain the
JDK documentation. You will need to go download one of the
archives:

    jdk-6u10-docs.zip jdk-6u10-docs-ja.zip

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

    http://java.sun.com/javase/downloads/

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] no
Abort installation of JDK documentation
dpkg: error processing sun-java6-doc (--configure):
 subprocess post-installation script returned error exit status 1
Setting up sun-java5-doc (1.5.0-18-1) ...
[/code]

As suggested you have to manually download the .zip file of javadoc an place it in /tmp
Then you must press RETURN instead of typing "no".