Ok, Linux on Steam is broken because you can't login to steam inside the client. This is because there is no steam 64-bit version for linux. We are currently working on a workaround for this issue that will allow linking of your steam account. I don't have an ETA on it yet. If you have access to a windows box you can work around like this: - login to the windows version of the game and link your steam account - delete steam.txt from the steam version of the game - run it and login using UberNet. As a general note linux is the furthest behind version and we have large number of issues to work through before it's really playable.