[Mono-list] HashSet appears present but uslessly broken on Ubuntu

[Jiří Zárevúcký]

>
> Not correct, actually. It's corlib 2.0, not mono 2.0. The package's
> version really is mono's version.
>
> If you don't believe me, check versions for all ubuntu releases here:
> http://packages.ubuntu.com/search?searchon=names&keywords=libmono-corlib
>

And just to be clear, the only release to include Mono 2.0 _will_ be
Jaunty, which wasn't even released yet.