ubuntu 14.04

一、numlock
sudo vim  /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf

[SeatDefaults]
greeter-session=unity-greeter
greeter-setup-script=/usr/bin/numlockx on


二、取消guest

sudo nano /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf

allow-guest=false