Disabling Ubuntu Mate GUI on Startup

When you have already configured SSH in you BPI, you don't need GUI anymore unless you want to use your BPI as a media center. Turning off GUI enables a lot of resources because the xorg services is off.

to turn off GUI:
systemctl disable lightdm

to turn it on again:
systemctl enable lightdm

You can see that the xorg process itself is taking 25-45% of CPU usage.

another way to turning it off is by:

systemctl set-default multi-user.target --force 

systemctl disable lightdm.service --force

systemctl disable graphical.target --force 

systemctl disable plymouth.service --force