The crash turns out to be due to a combination of several things:

* the authd patches were disabled in latest src:gnome-shell, including the 
definition of the missing key (presumably to make migration easier)
* the binary gnome-shell package could not upgrade through simple `apt upgrade` 
due to some transition
* the interdependency between gnome-shell (which has the crashing code) and 
gnome-shell-common (which holds the gsettings definitions) isn't using (= 
${binary:Version}) but rather a manually defined boundary (>= 47~rc).

So I ended up with a partially upgraded system.

IMHO, not having a strict equality bound on this kind of relationship is
a straight bug.

** Also affects: gnome-shell (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: gcr (Ubuntu)

** Summary changed:

- 
/usr/libexec/gcr-prompter:11:gtk_im_multicontext_set_slave:im_module_setting_changed:g_closure_invoke:signal_emit_unlocked_R:signal_emit_valist_unlocked
+ gnome-shell breaks on partial upgrades

** Summary changed:

- gnome-shell breaks on partial upgrades
+ gnome-shell 48 breaks on partial upgrades

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to gcr in Ubuntu.
https://bugs.launchpad.net/bugs/2098654

Title:
  gnome-shell 48 breaks on partial upgrades

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  The Ubuntu Error Tracker has been receiving reports about a problem regarding 
gcr.  This problem was most recently seen with package version 3.41.2-1build3, 
the problem page at 
https://errors.ubuntu.com/problem/f88a0764d64cfefc84addd1205ea7824f0aec75c 
contains more details, including versions of packages affected, stacktrace or 
traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software 
developer, you can request it at http://forms.canonical.com/reports/.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2098654/+subscriptions


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