The problem isn't the code, the problem is that there is no executable for Linux. There all for windows. And I'm not going to install an emulator such as Wine when I know for a fact that Unity can export for Linux.
wine is not an emulator, but a container of sorts. It translates windows syscalls to linux and provides some core windows libs. An emulator would be able to run any program the emulated system could. Wine does not work for some programs.