I think the real problem here is that the postinst didn't immediately fail when adduser failed. I don't understand why not, though, since the postinst runs set -e, and:
|# adduser 0 |adduser: Please enter a username matching the regular expressionconfigured |via the name_regex configuration variable. Use the `--force-badname' |option to relax this check or reconfigure name_regex. |# echo $? |1 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

