We would like to encourage everyone to supervise this major upgrade physically. As such, it cannot be performed from the GUI. Instead, go to the root console menu, choose option 12 and type "17.1" at the prompt. Alternatively, SSH can be used to perform the upgrade. The process will download a full set of updates and reboot multiple. All operating system files and packages will be reinstalled as a consequence. Another method is to import and reinstall using a new installation image, which can also retain your settings (selecting "Import Configuration"), then reformat the disk and apply a clean system (selecting "Guided Installation").