I recently did a completer reinstall with Debian Stable (Buster) with options "Debian desktop" and "KDE".
In order to allow root logins, (yeah, I've had the lecture that root login is dangerous) the instructions are to reset the field for allowable logins to 0 (root account). That enables login to every account in the system, such as CUPS. The Gnome login prompt is an editable field instead of scrolling thru all the other accounts.
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