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

useful bash script for disabling/enabling desktop environment at boot in Ubuntu Mate for Raspberry.