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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.

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first off all you have to boot from Live-USB with Ubuntu OS on it.

then run this command:

 sudo apt-get purge grub grub-pc grub-common

when asked select yes.

after that install grub with this command:

 sudo apt-get install grub-common grub-pc

Ensure that you select “/dev/sda” over the “/dev/sda1″ partition.

reboot your PC and you'll get the default grub2.

  • Thank you for your prompt response. However, I tried running the commands off of an Ubuntu Live USB and still wound up with the Kali GRUB. – c7330x Aug 17 '15 at 22:26
  • boot to kali and do the second command, Note you'll have no grub after that, now boot to the ubuntu live-USB and do the second command. from there, and add this command after that sudo update-grub. if this worked please let me know to update my answer. – RonnieDroid Aug 17 '15 at 22:33
  • sorry meant, boot to kali and do the first command. :D – RonnieDroid Aug 17 '15 at 22:41
  • Still getting the Kali GRUB. Could it possibly have something to do with the pre-installed Windows 8.1 having the sda2 partition be the efi boot loader? – c7330x Aug 17 '15 at 23:47
  • @c7330x maybe, can you use the EasyBCD app from windows and remove frub from there. then do the boot-usb steps and only do the second command, and the sudo update-grub. and make sure to install it in the same partition as the windows boot-loader. – RonnieDroid Aug 17 '15 at 23:50

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