What does the "Not In List" button do in the Ubuntu login screen?

Question

In Ubuntu 21.04, what does the "Not In List" button do when you're trying to log in to your account?

score 3 · Answer 1 · answered Sep 20 '21 at 17:55

In principle, this list contains all of the Ubuntu users that can login, i.e. have a login shell specified in /etc/passwd.

However, a systems administrator can choose to hide a user from the list on the login page. On how to do this, see How do I hide a particular user from the login screen?

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