Comment 2 for bug 438994

I can confirm it with Ubuntu 9.10:
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sudo apt-get install sun-java6-doc
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  sun-java6-doc
........
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]
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If you press Enter, the info is repeated on stdout. If you type "no + Enter", installer fails:
-----------------
[Press RETURN to try again, 'no' + RETURN to abort] no
Abort installation of JDK documentation
dpkg: error processing sun-java6-doc (--configure):
 subprocess installed post-installation script returned error exit status 1
E: Sub-process /usr/bin/dpkg returned an error code (1)
-----------------

I think it shouldn't fail, it should be finished without error even in case of "no+Enter".