How To Change Boot Order on Ubuntu (Grub2)

Changing boot order and time default on Ubuntu is not hard as you thought. The first thing to do is check the order of boot menu in "/boot/grub/grub.cfg". They start from "0" value, so just memorize the position. The next thing to do is adjust file "/etc/default/grub" file.

As you can see, I changed the boot order from 0 to 6. The "Time Out" value now is 4 second.

Last, you have to run "update-grub" command to verify it.

Have fun!