Check this link
It has been a while since I used it but apparently the only Linux it is actually made for is Ubuntu and derivatives. You could install it from source (assuming you can actually get the source code) on any other if you so wanted. It is available for Windows, Mac, iPhone, Android, and Ubuntu. You'd think they'd make it easily available for all Linux users if they ar going to make it available for everyone else that doesn't use Linux. I personally now prefer DropBox and am even going to try OwnCLoud soon.