How to disable user list and guest user login in Ubuntu 16.04 LTS

To disable the user list and guest user login in Ubuntu 16.04 LTS login screen, open a terminal window and do the following:

$ cd /etc/lightdm <enter> $ sudo mkdir lightdm.conf.d <enter> $ sudo cd lightdm.conf.d <enter> $ sudo mousepad 50-config.conf <enter>

Enter the text below into the file.

[SeatDefaults] greeter-hide-users=true greeter-show-manual-login=true allow-guest=false

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