Ubuntu 12.4
vi /etc/lightdm/lightdm.confgreeter-session=unity-greeter
user-session=ubuntu
greeter-show-manual-login=true #手工输入登陆系统的用户名和密码
allow-guest=false #不允许guest登录
sudo apt-get install gnome-session-fallback
vi /etc/lightdm/lightdm.conf
user-session=ubuntu ---> user-session=gnome-classic
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