I've just upgraded my Ubuntu Desktop from 10.04 to 10.10 on my netbook.
How can I install Ubuntu Unity for my notebook ?
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You just need to install the package ubuntu-netbook.
First question: Ubuntu Unity.
Unity is the default environment on Ubuntu Netbook. You can download it from here
The instructions for installation are also there. If you need clarification, just ask.
Second question: Ubuntu One Ubuntu One comes standard as part of any recent Ubuntu installation. You have to sign up for the service before you can access any space online, but any ubuntu or supported derivative (kubuntu, ubuntu netbook, edubuntu, ...) will have the client installed. In addition to this, an app was developed for the iPhone and for Android so that you can access your files from your mobile (should you have an iPhone or Android.) Canonical is also working on releasing a Windows version of the Ubuntu one client. You can get all the details from the ubuntu site (one.ubuntu.com)