The weird pissing fight that this current Mono controversy has become had a reality check in the form of rms posting a cautionary note about dependence on Mono applications in case some sort of magic bullet patent is fished out of cold storage to fuck with Mono. This is a measured and sane warning from a person I respect tremendously but the response to it has been largely to read the first three lines and proclaim righteous victory over the oppressive forces of whoever is supposed to be a tool of the evil empire this month.
So, here are some things you should consider before shooting off your stupid mouth:
1. C#'s specification (the HIV to Mono's AIDS if you're batshit crazy) is recognized as an ECMA standard specification is is not in fact some kind of nutty language library neutron bomb created to rid the world of Linux.
2. The GNU project actually has their own version of this functionality called Portable.NET. Chances are given that C# is a specification and not a curse muttered by an Egyptian king before his death should some legal action be taken against Mono implementation that existing applications could be adapted to use the GNU runtime.
3. I have absolutely nothing to say about the Ubuntu forum controversies because I avoid both that distribution and its acolytes like the plague on common sense that they are.