Well, I think I have figured it out.
The behavior is easy to reproduce if there is only one user account on
the system. Then the Login Screen button is not shown, but OTOH changes
of language/format/input sources are written to /etc/default/locale
respective /etc/default/keyboard without asking for it explicitly.
If you add another user, the button shows up.
So this seems to be about the GNOME thinking in this respect which I'm
not used to, and right now I don't like it either. Look at the Ask
Ubuntu answer I linked to. I tried to help the OP based on what I saw on
my own machine (with more than one user account), but the OP didn't
understand what I was talking about.
The GNOME folks seem to be too smart for their own good. Things like
this cause confusion!! :(
Closing. (Some day, when I'm in a better mood, I may file an upstream
bug.)
** Changed in: gnome-control-center (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1730900
Title:
"Login Screen" button not present in Region & Language
Status in gnome-control-center package in Ubuntu:
Invalid
Bug description:
On my Ubuntu 17.10, which was upgraded from 17.04, the Settings ->
Region & Language window includes a "Login Screen" button at the top
right, which allows me to set language, format and input sources also
system wide, i.e. affecting the login screen. The Ask Ubuntu answer
<https://askubuntu.com/a/973915> shows its location.
However, on an (almost) fresh install of Ubuntu 17.10, that button is
not present.
I don't know what the intended design is in this respect.
* If the button is supposed to be there, some dependency necessary for
it to function might be missing.
* If the button is not supposed to be there, is there some other GUI
way to control those settings system wide?
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