Modifying Login Screen Options on Ubuntu 12

Below are tips to modifying the login screen on ubuntu

Tip 1: Enable the "other" user option on login screen
1. Open /etc/lightdm/lightdm.conf
2. Add the following line to the file
     "greeter-show-manual-login=true"
3. Restart the lightdm service or reboot the machine
     "sudo service lightdm restart"

Tip 2: Hide all user accounts on login screen
1. Open /etc/lightdm/lightdm.conf
2. Add the following line to the file
     greeter-hide-users=true
3. Restart the lightdm service or reboot the machine
     "sudo service lightdm restart"

Tip 3: Disable Guest login
1. Open /etc/lightdm/lightdm.conf
2. Add the following line to the file
     allow-guest=false
3. Restart the lightdm service or reboot the machine
     "sudo service lightdm restart"

Tip 4: You can script changes to this config file by using the following command
     /usr/lib/lightdm/lidghtdm-set-defaults