lightdm

add these two lines under [SeatDefaults] in /etc/lightdm/lightdm.conf.d/90.nvidia.confgreeter-hide-users=truegreeter-show-manual-login=true new way: create /etc/lightdm/lightdm.conf.d/10-ubuntu.conf with: [Seat:*]user-session=ubuntugreeter-show-manual-login=truegreeter-hide-users=trueallow-guest=false