i went through those steps trying to get the java-6-doc.zip to get through the install, but instead of the unpacked install complete goodness that you got for output, this came out.

Setting up sun-java6-doc (6-00-2ubuntu2) ...
[/tmp/jdk-6-doc.zip]
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in one of /tmp/jdk-6-doc.zip or
/tmp/jdk-6-doc.zip.zip, and cannot find /tmp/jdk-6-doc.zip.ZIP, period.
dpkg: error processing sun-java6-doc (--configure):
subprocess post-installation script returned error exit status 9
Errors were encountered while processing:
sun-java6-doc

is this saying something to the effect that i need the install cd? this was downloaded of the net, and there aren't more volumes available of this file.