I have the same problem. I have a computer that originally ran Sarge, that I upgraded to Etch when that became stable, and that I now attempted to upgrade to unstable. The upgrade failed when configuring docbook-xml. By Daniel's suggestion, here is the output of dpkg --configure docbook-xml when run with set -ex in vim /var/lib/dpkg/info/docbook-xml.postinst
Setting up docbook-xml (4.5-5) ... + '[' configure = configure ']' + rm -f /etc/sgml/docbook-xml.cat + for ordcat in /usr/share/xml/docbook/schema/dtd/catalog /usr/share/xml/docbook/schema/dtd/4.0/catalog /usr/share/xml/docbook/schema/dtd/4.1.2/catalog /usr/share/xml/docbook/schema/dtd/4.2/catalog /usr/share/xml/docbook/schema/dtd/4.3/catalog /usr/share/xml/docbook/schema/dtd/4.4/catalog /usr/share/xml/docbook/schema/dtd/4.5/catalog + update-catalog --quiet --add /etc/sgml/docbook-xml.cat /usr/share/xml/docbook/schema/dtd/catalog + for ordcat in /usr/share/xml/docbook/schema/dtd/catalog /usr/share/xml/docbook/schema/dtd/4.0/catalog /usr/share/xml/docbook/schema/dtd/4.1.2/catalog /usr/share/xml/docbook/schema/dtd/4.2/catalog /usr/share/xml/docbook/schema/dtd/4.3/catalog /usr/share/xml/docbook/schema/dtd/4.4/catalog /usr/share/xml/docbook/schema/dtd/4.5/catalog + update-catalog --quiet --add /etc/sgml/docbook-xml.cat /usr/share/xml/docbook/schema/dtd/4.0/catalog + for ordcat in /usr/share/xml/docbook/schema/dtd/catalog /usr/share/xml/docbook/schema/dtd/4.0/catalog /usr/share/xml/docbook/schema/dtd/4.1.2/catalog /usr/share/xml/docbook/schema/dtd/4.2/catalog /usr/share/xml/docbook/schema/dtd/4.3/catalog /usr/share/xml/docbook/schema/dtd/4.4/catalog /usr/share/xml/docbook/schema/dtd/4.5/catalog + update-catalog --quiet --add /etc/sgml/docbook-xml.cat /usr/share/xml/docbook/schema/dtd/4.1.2/catalog + for ordcat in /usr/share/xml/docbook/schema/dtd/catalog /usr/share/xml/docbook/schema/dtd/4.0/catalog /usr/share/xml/docbook/schema/dtd/4.1.2/catalog /usr/share/xml/docbook/schema/dtd/4.2/catalog /usr/share/xml/docbook/schema/dtd/4.3/catalog /usr/share/xml/docbook/schema/dtd/4.4/catalog /usr/share/xml/docbook/schema/dtd/4.5/catalog + update-catalog --quiet --add /etc/sgml/docbook-xml.cat /usr/share/xml/docbook/schema/dtd/4.2/catalog + for ordcat in /usr/share/xml/docbook/schema/dtd/catalog /usr/share/xml/docbook/schema/dtd/4.0/catalog /usr/share/xml/docbook/schema/dtd/4.1.2/catalog /usr/share/xml/docbook/schema/dtd/4.2/catalog /usr/share/xml/docbook/schema/dtd/4.3/catalog /usr/share/xml/docbook/schema/dtd/4.4/catalog /usr/share/xml/docbook/schema/dtd/4.5/catalog + update-catalog --quiet --add /etc/sgml/docbook-xml.cat /usr/share/xml/docbook/schema/dtd/4.3/catalog + for ordcat in /usr/share/xml/docbook/schema/dtd/catalog /usr/share/xml/docbook/schema/dtd/4.0/catalog /usr/share/xml/docbook/schema/dtd/4.1.2/catalog /usr/share/xml/docbook/schema/dtd/4.2/catalog /usr/share/xml/docbook/schema/dtd/4.3/catalog /usr/share/xml/docbook/schema/dtd/4.4/catalog /usr/share/xml/docbook/schema/dtd/4.5/catalog + update-catalog --quiet --add /etc/sgml/docbook-xml.cat /usr/share/xml/docbook/schema/dtd/4.4/catalog + for ordcat in /usr/share/xml/docbook/schema/dtd/catalog /usr/share/xml/docbook/schema/dtd/4.0/catalog /usr/share/xml/docbook/schema/dtd/4.1.2/catalog /usr/share/xml/docbook/schema/dtd/4.2/catalog /usr/share/xml/docbook/schema/dtd/4.3/catalog /usr/share/xml/docbook/schema/dtd/4.4/catalog /usr/share/xml/docbook/schema/dtd/4.5/catalog + update-catalog --quiet --add /etc/sgml/docbook-xml.cat /usr/share/xml/docbook/schema/dtd/4.5/catalog + update-catalog --quiet --add --super /etc/sgml/docbook-xml.cat + '[' configure = configure ']' + update-xmlcatalog --add --type system --id http://www.oasis-open.org/docbook/xml/4.1/docbookx.dtd --package docbook-xml --local /usr/share/xml/docbook/schema/dtd/catalog.xml + update-xmlcatalog --add --type system --id http://docbook.org/xml/4.1/docbookx.dtd --package docbook-xml --local /usr/share/xml/docbook/schema/dtd/catalog.xml + update-xmlcatalog --add --type public --id '-//OASIS//DTD DocBook XML V4.1//EN' --package docbook-xml --local /usr/share/xml/docbook/schema/dtd/catalog.xml update-xmlcatalog: error: entity already registered dpkg: error processing docbook-xml (--configure): subprocess post-installation script returned error exit status 1 Errors were encountered while processing: docbook-xml -Alan Somers Alesis, LLC 300 Corporate Pointe, Suite 500 Culver City, CA 90230 Tel: 310-693-7005 Ext. 7027 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]