Linux support has "uh... xyz does not work on Blah Linux with foo-bar-0.2.7.1, it used to work with foo-bar-0.2.7.0-a3" on a regular basis
You assume that one must support EVERY Linux distribution. You can just support Fedora and Debian derivatives, and you'll probably be fine. Besides, that's what forum support is for! Who expects phone support from a video game studio? I certainly don't.