Install docbook-xsl-doc-html by entering the following commands in the terminal:
sudo apt update sudo apt install docbook-xsl-doc-html
Description:
stylesheets for processing DocBook XML files (HTML documentation)
DocBook XSL stylesheets are modular XSL stylesheets for processing documents composed with the DocBook XML DTD and its derivatives. . This package contains the documentation for the DocBook XSL stylesheets and explanations for the parameters you can use in HTML format.
Homepage: http://wiki.docbook.org/topic/DocBookXslStylesheetDocs
Version: 1.78.1-1
Section: universe/doc