Public bug reported:

Such crash has already happened several times after validating the greeter's 
password to open a gnome-shell session.
This does not happen each time, but always, after the password validation, it 
looks like the system have some difficulties to load X : that takes too much 
time, the background goes grey, and 5 or 10 seconds later, the session is 
opened, or i get such a crash.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: gnome-shell 3.18.2-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
Uname: Linux 4.4.0-2-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.19.4-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Jan 29 14:08:52 2016
DisplayManager: lightdm
ExecutablePath: /usr/bin/gnome-shell
ProcCmdline: /usr/bin/gnome-shell
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: gnome-shell
StacktraceTop:
 g_assertion_message () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_assertion_message_expr () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /usr/lib/gnome-shell/libgnome-shell.so
 g_object_run_dispose () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 clutter_actor_destroy () from /usr/lib/x86_64-linux-gnu/libclutter-1.0.so.0
Title: gnome-shell crashed with SIGABRT in g_assertion_message()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
XsessionLog:
 openConnection: connect: No such file or directory
 cannot connect to brltty at :0
 Could not connect to D-Bus server: org.freedesktop.DBus.Error.NoServer: Failed 
to connect to socket /tmp/dbus-M92EaZdecj: Connection refused
 upstart: upstart-event-bridge main process (1801) terminated with status 1
 upstart: upstart-event-bridge main process ended, respawning

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


** Tags: amd64 apport-crash need-amd64-retrace third-party-packages xenial

** Attachment added: ".xsession-errors"
   
https://bugs.launchpad.net/bugs/1539591/+attachment/4559163/+files/.xsession-errors

** Information type changed from Private to Public

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https://bugs.launchpad.net/bugs/1539591

Title:
  gnome-shell crashed with SIGABRT in g_assertion_message()

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