Like the similar upstream bug
https://gitlab.gnome.org/GNOME/mutter/-/issues/1475, this appears to be
caused by the intersection of:

 (a) GTK being used in the gnome-shell process (usually by extensions);
and

 (b) The absence of an Xserver for GTK to connect to (Xwayland is only
started on-demand now).

It looks like one possible offender using GTK is gnome-shell-extension-
appindicator. I'm not sure about the other extensions, and it's hard to
tell with desktop-icons-ng which in theory uses GTK in a safe way (in a
separate client process).

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Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1949200

Title:
  gnome-shell crashed with SIGTRAP from error "Can't create a
  GtkStyleContext without a display connection" in
  gtk_style_context_init

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