Thank you. I can reproduce your problem with your file. Unless just waiting for the user to call dpkg-reconfigure ddclient is considered as "asking", ddclient seems to violate the requirement "These scripts [...] must not overwrite or otherwise mangle the user's configuration without asking [...]".
-- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]