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I honestly haven't gotten Aground running on a chromebook yet, but try following this guide: https://www.howtogeek.com/363331/how-to-set-up-and-use-linux-apps-on-chrome-os/ . If your model supports the new chromebook os, it should work.

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...