I used to modify
/etc/lightdm/lightdm.conf, adding the line
greeter-show-manual-login=true, in order to allow login for hidden users and root.
Now I've just installed the new Ubuntu 14.04 and the file
lightdm.conf is no longer located in
/etc/lightdm. It's in
/etc/init and has been totally modified.
How can I force lightdm login screen to show a field to input a login name?