Well isn't GRUB still used on systems that don't use secure boot but then switches to efilinux when secure boot is detected? Canonicals method just secures the bootloader and doesnt sign all the packages like the red hat method. Here is one place where I got the details:

http://m.theinquirer.net/inquirer/news/2186842/canonical-intels-efilinux-ubuntu-uefi-secure-boot

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