/usr/share/sgml/docbook/dtd/catalog is in docbook 4.5-5.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- Prefer PUBID to SYSID ................................................ --
OVERRIDE YES
-- latest DocBook --
PUBLIC "-//OASIS//DTD DocBook//EN" "4.5/docbook.dtd"
-- disabled, see README.docbook.dcl --
-- DTDDECL "-//OASIS//DTD DocBook//EN" "4.5/docbook.dcl" --
-- latest DocBook v4--
PUBLIC "-//OASIS//DTD DocBook V4//EN" "4.5/docbook.dtd"
-- disabled, see README.docbook.dcl --
-- DTDDECL "-//OASIS//DTD DocBook V4//EN" "4.5/docbook.dcl" --
-- latest DocBook v3--
PUBLIC "-//OASIS//DTD DocBook V3//EN" "3.1/docbook.dtd"
-- disabled, see README.docbook.dcl --
-- DTDDECL "-//OASIS//DTD DocBook V3//EN" "3.1/docbook.dcl" --
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