Switch between GUI to Text mode:

	On next reboot:
		$ systemctl set-default multiuser.target

	In GRUB menu:
		Add a  '3' (without apostrophes) at the end of linux line.

		'1' is for lunching single user mode.


Switch between Text to GUI:

	On next reboot:
	$ systemctl set-default graphycal.target

	In GRUB menu:
		Add a  '5' (without apostrophes) at the end of linux line.