I'm glad to hear you got it working!
When using RVM, you don't need to uninstall a Ruby version (unless you really want to). You install the version you want, then switch to it.
I know the conflict between Asciidoctor PDF 1.5.x and Ruby 3 is a real pain. It hit at a really inconvenient time for me. But I'm working on getting Asciidoctor PDF 2 released, which will solve it.
I have heard that the following works to get Asciidoctor PDF 1.5.x installed on Ruby 3, but it's not the official solution:
gem install --pre asciidoctor-pdf
On Thu, Feb 18, 2021, 11:48 Elisa [via Asciidoctor :: Discussion] <[hidden email]
Here's an update, although I could not uninstall Ruby 3.0.0, I can get the footnotes working by specifying the use of 2.7.2--just had to install some gems after specifying 2.7.2 to get it working. So I'm good for now.
I might end up with some questions about using latexmath. :-)
Thanks for the help.