Bash script to enable/disable the GUI on boot for Ubuntu Mate. Tested on Ubuntu Mate 15.04 on a Raspberry Pi 2 B.

bootgui

#!/bin/bash
# Call with either enable or disable as first parameter
if [[ "$1" == 'enable' || "$1" == 'disable' ]]; then
  sudo systemctl set-default multi-user.target --force
  sudo systemctl $1 lightdm.service --force
  sudo systemctl $1 graphical.target --force
  sudo systemctl $1 plymouth.service --force
else
  echo Call with either "enable" or "disable" as first parameter.
fi