Permanently turn off graphics

 If you are running linux as a server, you do not need graphics wasting RAM.

vi /etc/default/grub

replace "splash" with "text"

update-grub

systemctl enable multi-user.target --force

systemctl set-default multi-user.target

systemctl set-default multi-user

systemctl isolate multi-user.target

gnome-session-quit

systemctl stop gdm

systemctl disable gdm

apt remove gdm


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