Ubuntu's Display Settings seem to be user-specific and are not applied until after login. How can I make my display settings apply to the login screen as well?
(This is quite annoying cause it causes the login screen to pop up on whatever monitor Ubuntu defaults as the "main screen". In my case, this happens to be my 4K TV situated well away from my desk.)
This answer does not work since Ubuntu changed display manager from LightDM to GDM in 16.04.
