https://bugs.winehq.org/show_bug.cgi?id=40666
--- Comment #8 from Josh winehq@iooioio.hadar.uberspace.de --- The game does have a multiplayer mode but I've never tried it.
I get that warning about libgnutls on pretty much everything I launch with wine. Never understood it though, since I do have it installed:
$ dpkg -l | grep libgnutls ii libgnutls-dev:amd64 3.4.10-4ubuntu1.4 amd64 GNU TLS library - development files ii libgnutls-openssl27:amd64 3.4.10-4ubuntu1.4 amd64 GNU TLS library - OpenSSL wrapper ii libgnutls30:amd64 3.4.10-4ubuntu1.4 amd64 GNU TLS library - main runtime library ii libgnutls30:i386 3.4.10-4ubuntu1.4 i386 GNU TLS library - main runtime library ii libgnutlsxx28:amd64 3.4.10-4ubuntu1.4 amd64 GNU TLS library - C++ runtime library