AppImage

Why isn't a .AppImage file opening?

Whenever I try and open up the .AppImage of Unity, this appears Screenshot 2020-12-08 at 3.45.26 PM
I am pretty new to Unity, but I’ve been looking around on forums and can’t find anything that can help me. The link in the error message doesn’t really do much, but it did link me here, so I hope that you can help. This may be a Chromebook thing though, but like I said, I’m new so I’m not sure.