#0  0x00007faee44f1b37 in notify_have_shell (manager=0x17f1500) at gsd-xsettings-manager.c:780
  775: notify_have_shell (GnomeXSettingsManager   *manager)
  776: {
  777:         int i;
  778: 
  779:         gnome_settings_profile_start (NULL);
  780:         for (i = 0; manager->priv->managers [i]; i++) {
  781:                 /* Shell is showing appmenu if either GNOME Shell or Unity is running. */
  782:                 xsettings_manager_set_int (manager->priv->managers [i], "Gtk/ShellShowsAppMenu",
  783:                                            manager->priv->have_shell || manager->priv->have_unity);
  784:                 /* Shell is showing menubar *only* if Unity runs */
  785:                 xsettings_manager_set_int (manager->priv->managers [i], "Gtk/ShellShowsMenubar",
#1  0x00007faef4ed6343 in do_call (client=0x1840c50, call_type=CALL_TYPE_NAME_VANISHED) at /build/buildd/glib2.0-2.39.4/./gio/gdbusnamewatching.c:214
  [Error: /build/buildd/glib2.0-2.39.4/./gio/gdbusnamewatching.c was not found in source tree]
#2  0x00007faef0f03adc in ffi_call_unix64 () at ../src/x86/unix64.S:76
  [Error: ../src/x86/unix64.S was not found in source tree]
#3  0x00007faef0f0340c in ffi_call (cif=cif@entry=0x7fff833a0a00, fn=0x7faef4ed6870 <on_connection_disconnected>, rvalue=0x7fff833a0970, avalue=avalue@entry=0x7fff833a0910) at ../src/x86/ffi64.c:522
  [Error: ../src/x86/ffi64.c was not found in source tree]
#4  0x00007faef4bc4ab8 in g_cclosure_marshal_generic (closure=0x179f6c0, return_gvalue=0x0, n_param_values=<optimized out>, param_values=<optimized out>, invocation_hint=<optimized out>, marshal_data=0x0) at /build/buildd/glib2.0-2.39.4/./gobject/gclosure.c:1447
  [Error: /build/buildd/glib2.0-2.39.4/./gobject/gclosure.c was not found in source tree]
#5  0x00007faef4bc4278 in g_closure_invoke (closure=0x179f6c0, return_value=0x0, n_param_values=3, param_values=0x7fff833a0c00, invocation_hint=0x7fff833a0ba0) at /build/buildd/glib2.0-2.39.4/./gobject/gclosure.c:770
  [Error: /build/buildd/glib2.0-2.39.4/./gobject/gclosure.c was not found in source tree]
#6  0x00007faef4bd5c2d in signal_emit_unlocked_R (node=node@entry=0x17bd020, detail=detail@entry=0, instance=instance@entry=0x17be0b0, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fff833a0c00) at /build/buildd/glib2.0-2.39.4/./gobject/gsignal.c:3551
  [Error: /build/buildd/glib2.0-2.39.4/./gobject/gsignal.c was not found in source tree]
#7  0x00007faef4bdd919 in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fff833a0db8) at /build/buildd/glib2.0-2.39.4/./gobject/gsignal.c:3307
  [Error: /build/buildd/glib2.0-2.39.4/./gobject/gsignal.c was not found in source tree]
#8  0x00007faef4bddbd2 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=detail@entry=0) at /build/buildd/glib2.0-2.39.4/./gobject/gsignal.c:3363
  [Error: /build/buildd/glib2.0-2.39.4/./gobject/gsignal.c was not found in source tree]
#9  0x00007faef4ec7695 in emit_closed_in_idle (user_data=0x7faee0062780) at /build/buildd/glib2.0-2.39.4/./gio/gdbusconnection.c:1373
  [Error: /build/buildd/glib2.0-2.39.4/./gio/gdbusconnection.c was not found in source tree]
#10 0x00007faef48faa65 in g_main_dispatch (context=0x1784bf0) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3065
  [Error: /build/buildd/glib2.0-2.39.4/./glib/gmain.c was not found in source tree]
#11 g_main_context_dispatch (context=context@entry=0x1784bf0) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3640
  [Error: /build/buildd/glib2.0-2.39.4/./glib/gmain.c was not found in source tree]
#12 0x00007faef48fadc8 in g_main_context_iterate (context=0x1784bf0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3711
  [Error: /build/buildd/glib2.0-2.39.4/./glib/gmain.c was not found in source tree]
#13 0x00007faef48fb08a in g_main_loop_run (loop=0x17bf400) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3905
  [Error: /build/buildd/glib2.0-2.39.4/./glib/gmain.c was not found in source tree]
#14 0x00007faef5317ab5 in gtk_main () at /build/buildd/gtk+3.0-3.10.7/./gtk/gtkmain.c:1158
  [Error: /build/buildd/gtk+3.0-3.10.7/./gtk/gtkmain.c was not found in source tree]
#15 0x0000000000403714 in main (argc=1, argv=0x7fff833a10d8) at main.c:476
  471: 
  472:         if (do_timed_exit) {
  473:                 g_timeout_add_seconds (30, (GSourceFunc) timed_exit_cb, NULL);
  474:         }
  475: 
  476:         gtk_main ();
  477: 
  478:         g_debug ("Shutting down");
  479: 
  480:         if (name_id > 0) {
  481:                 g_bus_unown_name (name_id);