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Headless VNC on Mint
(feddit.de)
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According to The arch wiki, x11vnc operates differently than some other servers and is not capable of going headless. You'd need the dummy plug.
On that same page, though, it lists the alternative to x11vnc as Xvnc, and links to TigerVNC which is capable of going headless, and has an example config for going headless.
I haven't tested tigerVNC specifically, but it's known, so I expect this is the solution to your problem.
I tried to install TigerVNC but I got nowhere with it. Do you know any good guide or tutorial for seeing it up?
I found this. Hope it helps:
https://www.server-world.info/en/note?os=Debian_12&p=desktop&f=6