In Ubuntu 20.04, I can't open UnityHub.AppImage:

Shows this when I go to open it. Not sure if there is an application for running a .AppImage file type or a Unity version that’s compatible with Ubuntu 20.04. Any suggestions are appreciated.

You need to ensure that it’s marked executable via “chmod +x UnityHub.AppImage” or right click and set the same property

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Thanks, that worked!