My question is in regards to changing my default GRUB bootoader. Not the boot order, font, image, etc.
I have successfully triple booted both of my laptops. Their default OS's were both Windows 8.1, with UEFI and OEM pre-install. On the first I had all three OS's (Windows 8.1, Ubuntu 15.04 & Kali Linux 2.0) partitioned and installed prior to running Ubuntu boot-repair via live USB. This successfully gave me an Ubuntu GRUB. On the second laptop, It was dual-booted with Windows 8.1 and Kali 2.0 when I ran Ubuntu Boot-Repair via a live USB. This gave me a Kali GRUB default menu.
I would like to switch my second laptops default GRUB to Ubuntu's now that I have added the Ubuntu OS to it (After already running Ubuntu Boot-Repair). Mostly this will be so I can use Ubuntu Grub-Customizer to quickly and easily make changes as OS's are added and/or subtracted.
I'm sure this is an easy fix but I'm stuck and I've spent days trying to read and sort through material, but all I can find is changing fonts, orders, images, etc.