GRUB Customizer is an easy, GUI way to change the GRUB boot order, without having to edit system files manually.

To install it, we first need to add the repository:

sudo add-apt-repository ppa:danielrichter2007/grub-customizer -y
sudo apt-get update && sudo apt-get install grub-customizer -y

At the end of the installation, we start GRUB customizer with:

sudo grub-customizer

Then modify the boot order manually.