Install docbook-dsssl by entering the following commands in the terminal:
sudo apt update sudo apt install docbook-dsssl
modular DocBook DSSSL stylesheets, for print and HTML
This package provides DSSSL stylesheets which let you convert DocBook SGML or XML files to various formats. . This package contains two DocBook DSSSL stylesheets, one for "print" output and one for HTML. The print stylesheet can be used in conjunction with the RTF and the TeX back-ends that OpenJade provides to produce output suitable for printing. The HTML stylesheet can be used to convert DocBook documents into HTML. . The stylesheets are modular in design so that you can extend and customize them. . Note that you can also perform DocBook XML styling using the "docbook-xsl" package, which provides the XSL stylesheets. The XSL stylesheets are more actively maintained and contain more new features than these DSSSL stylesheets.