Disabling graphics interface (Debian)
When the graphics interface is not really needed (e.g. using as a server), it’s just better to disable the entire X11 stack to reduce the amount of memory and cpu used by the system.
To disable X11 on boot:
root@linaro-alip:~# systemctl set-default multi-user.target
To enable X11 again:
root@linaro-alip:~# systemctl set-default graphical.target