gnome-control-center emits these logs before crashing: 11:37:02.0053 Gtk[218301]:CRITICAL: Error building template class 'CcDateTimePanel' for an instance of type 'CcDateTimePanel': .:0:0 Invalid object type 'CcTzDialog' 11:37:02.0357 Gtk[218301]:CRITICAL: gtk_list_box_set_sort_func: assertion 'GTK_IS_LIST_BOX (box)' failed 11:37:02.0358 Gtk[218301]:CRITICAL: gtk_list_box_invalidate_sort: assertion 'GTK_IS_LIST_BOX (box)' failed 11:37:02.0866 Gtk[218301]:CRITICAL: gtk_lock_button_set_permission: assertion 'GTK_IS_LOCK_BUTTON (button)' failed 11:37:02.0867 Gtk[218301]:CRITICAL: gtk_switch_get_active: assertion 'GTK_IS_SWITCH (self)' failed 11:37:02.0867 Gtk[218301]:CRITICAL: gtk_switch_get_active: assertion 'GTK_IS_SWITCH (self)' failed 11:37:02.0867 Gtk[218301]:CRITICAL: gtk_widget_set_sensitive: assertion 'GTK_IS_WIDGET (widget)' failed 11:37:02.0867 Gtk[218301]:CRITICAL: gtk_widget_set_sensitive: assertion 'GTK_IS_WIDGET (widget)' failed 11:37:02.0867 Gtk[218301]:CRITICAL: gtk_widget_set_sensitive: assertion 'GTK_IS_WIDGET (widget)' failed 11:37:02.0867 Gtk[218301]:CRITICAL: gtk_widget_set_sensitive: assertion 'GTK_IS_WIDGET (widget)' failed 11:37:02.0870 Gtk[218301]:CRITICAL: gtk_spin_button_set_adjustment: assertion 'GTK_IS_SPIN_BUTTON (spin_button)' failed 11:37:02.0870 GLib-GObject[218301]:CRITICAL: invalid (NULL) pointer instance 11:37:02.0870 GLib-GObject[218301]:CRITICAL: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed 11:37:02.0870 Gtk[218301]:CRITICAL: gtk_spin_button_set_adjustment: assertion 'GTK_IS_SPIN_BUTTON (spin_button)' failed 11:37:02.0870 GLib-GObject[218301]:CRITICAL: invalid (NULL) pointer instance 11:37:02.0870 GLib-GObject[218301]:CRITICAL: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed 11:37:02.0870 Gtk[218301]:CRITICAL: gtk_single_selection_set_selected: assertion 'GTK_IS_SINGLE_SELECTION (self)' failed 11:37:02.0870 GLib-GObject[218301]:CRITICAL: g_object_bind_property_full: assertion 'G_IS_OBJECT (source)' failed 11:37:02.0870 GLib-GObject[218301]:CRITICAL: invalid (NULL) pointer instance 11:37:02.0870 GLib-GObject[218301]:CRITICAL: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed 11:37:02.0870 GLib-GObject[218301]:CRITICAL: invalid (NULL) pointer instance 11:37:02.0870 GLib-GObject[218301]:CRITICAL: g_signal_handlers_block_matched: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed 11:37:02.0870 GLib-GObject[218301]:CRITICAL: g_object_set: assertion 'G_IS_OBJECT (object)' failed 11:37:02.0871 GLib-GObject[218301]:CRITICAL: invalid (NULL) pointer instance 11:37:02.0871 GLib-GObject[218301]:CRITICAL: g_signal_handlers_unblock_matched: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed 11:37:02.0871 Gtk[218301]:CRITICAL: gtk_widget_set_visible: assertion 'GTK_IS_WIDGET (widget)' failed 11:37:02.0871 GLib-GObject[218301]:CRITICAL: g_object_bind_property_full: assertion 'G_IS_OBJECT (source)' failed 11:37:02.0871 GLib-GIO[218301]:CRITICAL: g_settings_bind_with_mapping: assertion 'G_IS_OBJECT (object)' failed 11:37:02.0873 GLib-GObject[218301]:CRITICAL: invalid (NULL) pointer instance 11:37:02.0873 GLib-GObject[218301]:CRITICAL: g_signal_handlers_block_matched: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed 11:37:02.0873 Adwaita[218301]:CRITICAL: adw_combo_row_set_selected: assertion 'ADW_IS_COMBO_ROW (self)' failed 11:37:02.0873 cc-time-editor[218301]:CRITICAL: cc_time_editor_set_am_pm: assertion 'CC_IS_TIME_EDITOR (self)' failed 11:37:02.0873 cc-time-editor[218301]:CRITICAL: cc_time_editor_set_time: assertion 'CC_IS_TIME_EDITOR (self)' failed 11:37:02.0873 Gtk[218301]:CRITICAL: gtk_single_selection_set_selected: assertion 'GTK_IS_SINGLE_SELECTION (self)' failed 11:37:02.0873 Gtk[218301]:CRITICAL: gtk_label_set_text: assertion 'GTK_IS_LABEL (self)' failed 11:37:02.0873 GLib-GObject[218301]:CRITICAL: invalid (NULL) pointer instance 11:37:02.0873 GLib-GObject[218301]:CRITICAL: g_signal_handlers_unblock_matched: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed 11:37:02.0874 cc-time-editor[218301]:CRITICAL: cc_time_editor_set_time: assertion 'CC_IS_TIME_EDITOR (self)' failed 11:37:02.0874 Gtk[218301]:CRITICAL: gtk_single_selection_set_selected: assertion 'GTK_IS_SINGLE_SELECTION (self)' failed 11:37:02.0874 Gtk[218301]:CRITICAL: gtk_label_set_text: assertion 'GTK_IS_LABEL (self)' failed 11:37:02.0874 cc-tz-dialog[218301]:CRITICAL: cc_tz_dialog_set_tz: assertion 'CC_IS_TZ_DIALOG (self)' failed 11:37:02.0874 cc-datetime-panel[218301]: WARNING: Timezone 'America/Los_Angeles' is unhandled, setting Europe/London as default 11:37:02.0874 cc-tz-dialog[218301]:CRITICAL: cc_tz_dialog_set_tz: assertion 'CC_IS_TZ_DIALOG (self)' failed 11:37:02.0874 cc-tz-dialog[218301]:CRITICAL: cc_tz_dialog_get_selected_location: assertion 'CC_IS_TZ_DIALOG (self)' failed This stack trace shows the location of the SIGSEGV: Thread 1 "gnome-control-c" received signal SIGSEGV, Segmentation fault. 0x00005555555a66fb in translated_city_name (loc=0x0) at ../gnome-control-center-44.0/panels/datetime/cc-datetime-panel.c:388 388 zone_translated = g_strdup (dgettext (GETTEXT_PACKAGE_TIMEZONES, loc->zone)); (gdb) bt #0 0x00005555555a66fb in translated_city_name (loc=0x0) at ../gnome-control-center-44.0/panels/datetime/cc-datetime-panel.c:388 #1 update_timezone (self=0x555555d6ebc0) at ../gnome-control-center-44.0/panels/datetime/cc-datetime-panel.c:411 #2 0x00005555555a6e45 in get_initial_timezone (self=) at ../gnome-control-center-44.0/panels/datetime/cc-datetime-panel.c:436 #3 0x00005555555a7ad2 in cc_date_time_panel_init (self=0x555555d6ebc0) at ../gnome-control-center-44.0/panels/datetime/cc-datetime-panel.c:965 #4 0x00007ffff7d77469 in g_type_create_instance () at /usr/lib64/libgobject-2.0.so.0 #5 0x00007ffff7d53008 in () at /usr/lib64/libgobject-2.0.so.0 #6 0x00007ffff7d55dde in g_object_new_valist () at /usr/lib64/libgobject-2.0.so.0 #7 0x00007ffff7d565e1 in g_object_new () at /usr/lib64/libgobject-2.0.so.0 #8 0x000055555558c62c in cc_panel_loader_load_by_name (shell=shell@entry=0x555555a97bc0, name=name@entry=0x555555d65e10 "datetime", title=title@entry=0x555555d65cc0 "Date & Time", parameters=parameters@entry=0x0) at ../gnome-control-center-44.0/shell/cc-panel-loader.c:245 #9 0x000055555559098a in activate_panel (gicon=, visibility=, name=0x555555d65cc0 "Date & Time", parameters=0x0, id=0x555555d65e10 "datetime", self=0x555555a97bc0) at ../gnome-control-center-44.0/shell/cc-window.c:157 #10 set_active_panel_from_id (self=0x555555a97bc0, start_id=0x555555d65e10 "datetime", parameters=0x0, add_to_history=1, force_moving_to_the_panel=0, error=) at ../gnome-control-center-44.0/shell/cc-window.c:419 #11 0x00007ffff7d4fe1c in g_cclosure_marshal_VOID__STRINGv () at /usr/lib64/libgobject-2.0.so.0 #12 0x00007ffff7d4cb88 in () at /usr/lib64/libgobject-2.0.so.0 #13 0x00007ffff7d6de57 in g_signal_emit_valist () at /usr/lib64/libgobject-2.0.so.0 #14 0x00007ffff7d6e667 in g_signal_emit () at /usr/lib64/libgobject-2.0.so.0 #15 0x000055555558ead6 in row_activated_cb (listbox=, row=0x555555cc9e80, self=0x555555a65f90) at ../gnome-control-center-44.0/shell/cc-panel-list.c:595 #16 0x00007ffff7d50426 in g_cclosure_marshal_VOID__OBJECTv () at /usr/lib64/libgobject-2.0.so.0 #17 0x00007ffff7d4cb88 in () at /usr/lib64/libgobject-2.0.so.0 #18 0x00007ffff7d6de57 in g_signal_emit_valist () at /usr/lib64/libgobject-2.0.so.0 #19 0x00007ffff7d6e667 in g_signal_emit () at /usr/lib64/libgobject-2.0.so.0 #20 0x00007ffff7d4cb88 in () at /usr/lib64/libgobject-2.0.so.0 #21 0x00007ffff7d6de57 in g_signal_emit_valist () at /usr/lib64/libgobject-2.0.so.0 #22 0x00007ffff7d6e9ad in g_signal_emit_by_name () at /usr/lib64/libgobject-2.0.so.0 #23 0x000055555558f0fa in cc_panel_list_set_active_panel (self=0x555555a65f90, id=0x555555d5da80 "datetime") at ../gnome-control-center-44.0/shell/cc-panel-list.c:1031 #24 0x0000555555590444 in cc_window_constructed (object=0x555555a97bc0) at ../gnome-control-center-44.0/shell/cc-window.c:737 #25 0x00007ffff7d5344f in () at /usr/lib64/libgobject-2.0.so.0 #26 0x00007ffff7d55dde in g_object_new_valist () at /usr/lib64/libgobject-2.0.so.0 #27 0x00007ffff7d565e1 in g_object_new () at /usr/lib64/libgobject-2.0.so.0 #28 0x0000555555590f9e in cc_window_new (application=application@entry=0x5555559a6b90, model=0x555555a5a160) at ../gnome-control-center-44.0/shell/cc-window.c:875 #29 0x000055555558a374 in cc_application_startup (application=0x5555559a6b90) at ../gnome-control-center-44.0/shell/cc-application.c:248 #30 0x00007ffff7d4cb88 in () at /usr/lib64/libgobject-2.0.so.0 #31 0x00007ffff7d6de57 in g_signal_emit_valist () at /usr/lib64/libgobject-2.0.so.0 #32 0x00007ffff7d6e667 in g_signal_emit () at /usr/lib64/libgobject-2.0.so.0 #33 0x00007ffff7e8c842 in g_application_register () at /usr/lib64/libgio-2.0.so.0 #34 0x00007ffff7e8cc1a in () at /usr/lib64/libgio-2.0.so.0 #35 0x00007ffff7e8cf78 in g_application_run () at /usr/lib64/libgio-2.0.so.0 #36 0x0000555555589a2b in main (argc=1, argv=0x7fffffffda28) at ../gnome-control-center-44.0/shell/main.c:87 But I think the SIGSEGV is a result of a precondition failing due to Gtk not finding the CcTzDialog object type, whatever that means.