Step-by-step – Ubuntu 16.04 GRUB Change Default OS Guide

Customizing Boot Order

4. 4. Running GRUB Customizer

   Finally, Launch & Enjoy GRUB Customizer
   From Desktop Make Use of the Launcher:

   

   Or from Command Line with:

   grub-customizer

5. 5. Setting Up OSes Boot Order

   Finally, to Modify Ubuntu 16.04 Boot Entries Order
   Choose the “General settings” Tab & “Default entry”:

   

   Finally Save & Exit:

   

Congratulations, your Ubuntu 16.04 New GRUB Boot Order setup should be now nicely working!