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idk I've tried everything I couldn't unzip the file I tried unziping it in the linux thing but it said unfound I finnaly tried "install ./Aground.sh" and it said file unsupported I tried moving all the game files to a different folder and installing that but NOTHING works wth more do I  have to do.

You don't have to install ./Aground.sh, just run ./Aground.sh, but that works in linux, I'm not sure about chromebooks, and I don't have a chromebook to try it on. The latest chromebook OS does say it supports linux apps, but I don't really know much more than that...