I want to edit this grub menu in a way that first option will boot automatically after 5 or 10 seconds without any key board input. second one Thanks
These cover what you trying to accomplish (set grub timout and set grub default menu entry): http://www.howtogeek.com/196655/how-to-configure-the-grub2-boot-loaders-settings/ http://askubuntu.com/questions/148095/how-do-i-set-the-grub-timeout-and-the-grub-default-boot-entry