On Ubuntu 14.04, I have the login screen shown in the attached image. Two problems:
1) How do I remove users from this list. For example, I don't want the user "guest" to show. I don't want guests logging in at all. I don't even know where this guest account is coming from as I can't see it in /etc/passwd.
2) The 1st "Mark Foley" user shown is really an Active Domain user Authenticated via winbind. The problem is I have 10 such users, but I have to first ssh in remotely as that AD user before he/she shows up on this page. What I'd like here is simply a blank userId space and NO users shown at all! There's no sense it giving half the User/Password info away to anyone looking at the screen.