http://bugs.winehq.org/show_bug.cgi?id=31011
--- Comment #3 from andrewsuicune@gmail.com 2012-06-25 19:20:22 CDT --- Don't know. I just followed the prompt after running a program using wine. Halfway through, there was an installation failure.
That's the reason I put up the bug; There is probably a way around it (that I'm not familiar with). Of course, I don't have any .NET apps, so I have little to no use for Mono anyway.
(In reply to comment #2)
Does it work if you put the msi files in /usr/local/share/wine/{gecko,mono} beforehand? See http://wiki.winehq.org/Gecko / http://wiki.winehq.org/Mono for more info.