sudo sed -i 's/^greeter-hide-users=true/greeter-hide-users=false/g' /etc/lightdm/lightdm.conf
sudo sed -i 's/^#greeter-allow-guest=true/greeter-allow-guest=false/g' /etc/lightdm/lightdm.conf
sudo sed -i 's/^#greeter-show-manual-login=false/greeter-show-manual-login=true/g' /etc/lightdm/lightdm.conf
sudo sed -i 's/^#allow-guest=true/allow-guest=false/g' /etc/lightdm/lightdm.conf
sudo sed -i 's/^#allow-guest=true/allow-guest=false/g' /etc/lightdm/lightdm.conf
sudo sed -i 's/^#autologin-user-timeout=0/autologin-user-timeout=10/g' /etc/lightdm/lightdm.conf
# also comment out default login from 'pi'
sudo sed -i 's/^autologin-user=pi/#autologin-user=pi/g' /etc/lightdm/lightdm.conf