"This message appears on a machine with Ubuntu …" – Are you sure it's not a message from the monitor itself? You interact with it by pressing buttons of the monitor, right? I'm pointing this out because the question is worded as if the message came from the "machine with Ubuntu". Yes, the video input is from the machine and the problem is probably with video config in Ubuntu, but if I'm right then "This message appears on a monitor connected to a machine with Ubuntu …" would probably be a better description.
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