I've never dealt with them, but I would get in touch with them and just tell them that the camera suddenly stopped working for no apparent reason. Don't hide the fact that you have ubuntu on there, but start by telling them that the camera doesn't work in the Asus program and in skype in windows. They will almost certainly want you to send it in, and it might be away for a long time. Certainly backup anything that is important that is on there before you send it anywhere.
Okay, I will try that. Thanks a lot for your help, you've been extremely helpful!