Just a quick reminder for anyone still using Ubuntu One's cloud based file storage service they have decided to close down the service. As of June 1st the file service no longer functions within the operating system and isn't even included in version 14.04 (most recent release). Today, you can log into the web interface and download your existing files via a zip file or migrate them using the Mover service. This option will remain until July 31st 2014 so make sure to get any of your goodies before that date!
If you're looking for a good alternative, I'd like to suggest Copy (see the link on the side of the site for bonus space). This service has been a great benefit for my file needs with good GUI and command line client support.