<p></p>
<p>You probably can't, the markdown plugin took a while to become GTK3 capable, so from when Debian/Ubuntu switched to GTK3 and the release with markdown GTK3 compatible its not available.</p>
<p>When Debian/Ubuntu catches up with a recent version of Geany-plugins it should appear again (assuming the package maintainer for those distros remembers to re-enable it if its manual).</p>

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