I just got "mono-complete" from Aptitude. It's only 67MB. I seem to recall that offline .NET installers were way bigger than that. Have I downloaded the wrong thing?
You may have only downloaded the libraries or only downloaded the runtime, although the suffix "complete" implies that you would have both. I think the libraries are in a package named mono-dev or something, try installing that.
No package by that name, but there is one called "libmono-dev". It was, however, installed so I guess I'll just assume I have it and see what happens. Maybe when I installed "libomono-complete" I had already installed some parts of it and forgotten about it.
Anyway, thanks for the advice everyone - chrisname and ultifinitus especially. Now I've just got to try and learn C# and D while also reading an introductory AI textbook, going to school and doing my masters... Never any time :/ Oh, well at least I have a two week half term <3