How to disable bootloader GUI?

Like in topic, I want to disable GUI in bootloader and make it similar to one from xubuntu (text only, no graphics). How can I do this?

My system is:
Ubuntu Mate 16.10 (Yakkety Yak) 32-bit
And bootloader:
(GRUB) 2.02~beta2-36ubuntu11

sudo nano /etc/default/grub

Remove the hash sign in front of:


So that it becomes:


Then run:

sudo update-grub