Sorry yes I overreacted to the first sentence without understanding the tone.

I think it's unfortunate anyone offers .deb (or similar) downloads really - the many Linux distros don't have a single packaging mechanism, so why pretend they do, or that your app's not going to work on the ones you don't provide?

Just say it's built for Linux, perhaps here's a binary, here's the source if available, this is the preferred name, go and check your package manager.