I eventually found the cause of the error message. I removed and replaced postfix-doc and the error went away. I suppose the package had been corrupt in some way.
-- Anthony Campbell - a...@acampbell.org.uk Microsoft-free zone - Using Debian GNU/Linux http://www.acampbell.org.uk - sample my ebooks at http://www.smashwords.com/profile/view/acampbell -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org