You must command KVM + USB DVD from your control panel. We not recommand to use debootstrap to install Ubuntu from netboot if you are not comfortable with the CLI and the manual installation. http://www.thegeekstuff.com/2010/01/debootstrap-minimal-debian-ubuntu-installation/ You can contact our sales departement to negociate modifying OS of your subscriptions, after that you might simply asked reset. Regards,