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cd /usr/share/lightdm/light.conf.d/

Global lightdm settings here

cd /etc/lightdm/
sudo nano lightdm.conf

Lightdm ubuntu-MATE greeter and lock screen issues

/usr/share/common/backgrounds/ubuntu-mate-common/Ubuntu-Mate-Cold.jpg
/etc/lightdm/lightdm-gtk-greeter.conf

The .conf file w/ some common sense parameters

[SeatDefaults]
allow-guest=false
greeter-hide-users=true

To set the global dark theme from the command line for gdm3

nano ~/.config/gtk-3.0/settings.ini
[Settings]
gtk-application-prefer-dark-theme=1