I think some distros disable using RSA by default. Might need to use it explicitly.

I don’t know if it’s that cut and dry. If you study a Operative Systems class or buy a book about them, it’ll exclusively deal with the kernel.

Are reading what you write? It’s linux so it isn’t?

I don’t get this comment. Gnome is not trying to make a walled garden, and Microsoft has taken every chance they get at making walled gardens (Windows phone, windows 8 arm, various proprietary file formats and protocols), they just haven’t been very successful at it.