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GRUB_SAVEDEFAULT= If set to true this setting will automatically set the last selected OS from the menu as the default OS on the next boot. No commands need be run to set the default OS. Any time a menu entry is manually selected from the GRUB 2 menu, it becomes the default OS. This option currently does not work if your /boot directory resides on an LVM partition or RAID. For this to work you must also set GRUB_DEFAULT=saved. Note: Ubuntu's version of Grub 1.99 introduced the submenu feature. Designating a default boot option located in the Previous Linux versions submenu requires special formatting. For information regarding the submenu feature, please refer to Grub2/Submenus