Comment 5 for bug 1896506

A run-time check would be ideal. Keep in mind with setting defaults statically that some releases are supported on multiple distro series. For example in ubuntu, ussuri is supported on focal and bionic. We can patch it in distro, of course, but what concerns me if we have to do that is that we can't comb through all future patches to ensure we're setting the right default. The upstream code should do the right thing depending on what version is available.