Despite installing image updates as they have come along , grub still boots from an earlier kernel . If I delete this old version , grub says there is no system installed and halts . I have tried update-grub and sure enough it lists the later versions so I know they are installed . The only way I can get the updated Lubuntu to run is to edit the grub file on each boot and direct it to the later kernel , which it then picks up and runsO.K. Is there any way I can permanently edit the grub to boot from the latest version ?