Welcome to the forums! But we're going to need some more information before we can provide any useful help. There is no technique that I am aware of for converting the games you mention to Python. Are you simply looking for a way to run those games on an Ubuntu system?
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...so you're basically asking us to write these three games in Python and compile them for use in Ubuntu? Pretty weird of a request.
You might be better off looking up emulators for Game Boy, whatever console Metal Slug is in, and you can download Mari0 for Linux, or the source code if you want to compile it yourself, here.
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