GRUB EFI Boot Menu

Use this option to add an additional menu item in the boot menu for the ISO, which will allow you to do an automated install after setting your preferences and potentially using any utilities on the standard boot menu.

This is for modern (EFI/UEFI) systems.

Alternative Configurations:

• Fully Automatic Installation

• GRUB non-EFI Boot Menu

0644 root root custom-iso/boot/grub/grub.cfg

set default 0
menuentry "Install Ubuntu Server w/ Saltstack minion" {
  set gfxpayload=keep
  linux /install/vmlinuz file=/cdrom/preseed/ubuntu-saltstack.seed debian-installer/language=en debian-installer/country=US console-setup/ask_detect=false keyboard-configuration/layoutcode=us debian-installer/locale=en_US.UTF-8 localechooser/preferred-locale=en_US.UTF8 quiet ---
  initrd /install/initrd.gz
}

Note

This assumes you place the custom entry first. Adjust default accordingly.

Proceed to Create Preseed Installation File