Posted by Mark S on Dec 21, 2020; 8:53am
URL: https://discuss.asciidoctor.org/Can-t-get-theme-to-work-with-asciidoctor-pdf-tp8410p8413.html

I used the asciidoctor and asciidoctor-pdf packages that come with Ubuntu 20.04 LTS.
Anyway, I've now removed those packages and installed using gem and it all works great now.
Thanks!