a) Linux Mint is based on Ubuntu. I have just looked at the software sources and ubuntu is included by default..
b) you may have markdown plugin installed by default see the following https://plugins.geany.org/markdown.html. and try the filtype set command as shown on the page. or else load a file with extension.md. After all geany handles some filetype out of the box.
it does seem to me there may be a slight design error in disabling Tools->plugin manager for pre-installed plugins.
I attach a sample.md file. with extension set as txt.
It would help me if you could help me if you have the same issue on your setup. I would then feel happier knowing it is not just me. (README.md files are regularly associated with githib !!)
Thanks in advance.
sample.txt

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