Install docbook-defguide by entering the following commands in the terminal:
sudo apt update sudo apt install docbook-defguide
Description:
DocBook: The Definitive Guide - HTML version
The official reference manual for the DocBook 4.x SGML and XML DTD, by Norman Walsh, Leonard Muellner, and Bob Stayton. This version is an evolution of the book of the same name published by O'Reilly (which documented DocBook 3.1). . This is a work in progress, which attempts to fully document DocBook 4.5, but may be inconsistent in some places.
Homepage: http://docbook.org/tdg/
Version: 2.0.17+svn9912-2
Section: universe/doc