Install gnome-doc-utils by entering the following commands in the terminal:
sudo apt update sudo apt install gnome-doc-utils
Description:
collection of documentation utilities for the GNOME project
gnome-doc-utils is a collection of documentation utilities for the GNOME project. Notably, it contains utilities for building documentation and all auxiliary files in your source tree, and it contains the DocBook XSLT stylesheets that were once distributed with Yelp.
Homepage: https://wiki.gnome.org/GnomeDocUtils
Version: 0.20.10-4
Section: universe/gnome