Note: I'm doing this because Leanpub (like atlas.oreilly.com) appears to be keeping proprietary the software for generating PDFs, ePub, Mobi etc from their open standard Markua. At least i couldn't find anything searching 'publish "markua" to PDF'. And Leanpub charges $99 to start writing a book with their toolset.
I followed the Debian instructions at http://asciidoctor.org/
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