"First of all, before you can install the application on your
computer, you need to request for an invitation code from Ubuntu.
If you have a Launchpad.net account, simply login to UbuntuOne and
request your invitation code, else it will prompt you to register a
"Secondly, your computer has to be Linux-based, specifically
Ubuntu Jaunty. The application does not work on Windows or Mac. If
you are using other Linux distro, or older version of Ubuntu, use
it at your own risk.
"The application for the invitation code can take up to 3 days.
Once you have received the code (via email), you can click on the
link to activate your account. Here is also where you select the
subscription plan. Currently, UbuntuOne offers a free 2GB storage
plan and a 10GB plan for US$10 per month."