Thanks Nintenduh for this guide. I have followed it and now I can play on my Macbook running Ubuntu 12.04 LTS. It's pretty cool I can run the game fullscreen and get 12-15FPS, considering the shitty specifications of this machine (Graphic card Intel 945GM, CPU 2GHz Intel Core Duo and 1MB RAM).
I have encountered a couple of issues and I thought to share it here in case somebody is stuck:
1) It seems mono isn't hosted anymore at http://ftp.novell.com/pub/mono/archive/2.4.2.3/windows-installer/3/, hence the wget command will fail. I don't know any reliable source, therefore I'm not going to provide any link. But if you search at Google for mono-2.4.2.3-gtksharp-2.12.9-win32-3.exe, it will give you a few links. Just download the file and run wine mono-2.4.2.3-gtksharp-2.12.9-win32-3.exe
2) When I try to run the N7 Launcher with the command wine ~/.wine/drive_c/Program\ Files/Net-7/bin/LaunchNet7.exe I get a window error saying that the configuration cannot be read. What I do instead is to manually go to the location (cd wine ~/.wine/drive_c/Program\ Files/Net-7/bin/) and then run the Launcher (wine LaunchNet7.exe).
3) Once I click on the Play button, an icon (Login) appears at the top taskbar. Then I Agree the E&B Service Rules of Conduct and it seems nothing happens (the Macbook doesn't have an activity HDD light). No worries, after a few seconds the game starts.
Hope it helps if anybody needs it.