Concerning the UPG group membership: As it is not necessary (and
redundant) and gives problems I believe users should not be made members
of their main groups.

As a result of adding the user to its main group deluser thinks the
primary group is not one adduser has created automatically as a user
private group (UPG) but a manually added group. So the empty group will
not be deleted automatically.

However if it truly is a UPG (created off record by users-admin) but is
not being deleted together with the user, this in turn may very quickly
lead to UPG accounts with primary GID != UID (when a user has been
deleted before). Only if, of course, the adduser UID allocation algrithm
is implemented in such a way that it does not skip UIDs with taken GIDs,
or the calling program makes that decision. (May this be an issue for
users-admin or adduser? May need fixing then, the same thing might
happen as soon as a group is created manually.)

(Let me stress that my feedback here is merely from a admin/users point
of view, not of any knowledge from adduser or useradd which it in turn I
believe depends on.)

FYI: I was editing the (UPG) related wiki page
https://wiki.ubuntu.com/MultiUserManagement when I got to users-admin.
You may like to have a look at. Those kind of informations might be
interesting for any users-admin user, and good for its help or wizard
texts?

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users-admin not following Debian policy
https://bugs.launchpad.net/bugs/488158
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