Boot to CLI
sudo systemctl set-default multi-user.target
Revert to GUI boot
sudo systemctl set-default graphical.target
Reference
https://unix.stackexchange.com/questions/90554/how-to-boot-linux-to-command-line-mode-instead-of-gui
sudo systemctl set-default multi-user.target
sudo systemctl set-default graphical.target
https://unix.stackexchange.com/questions/90554/how-to-boot-linux-to-command-line-mode-instead-of-gui