I have an Acer Aspire One that currently has no Operating System and I am trying to download the Ubuntu onto it and am having a hard time. I am using the USB method and seem to have gotten the installer and programs onto the USB fine. Also the Boot Priority is in order. However when the power is turned on with the USB after the greeting screen the only thing the screen says is "missing operating system_". Any help that could be offered would be greatly appreciated!