I tried to upgrade gnome 3.10 to gnome 3.12 in ubuntu 14.04 , but the upgradation was not successful and gnome-shell --version shows 3.10.4 . gnome-control-center has crashed showing : (gnome-control-center.real:22243): GLib-GObject-WARNING **: cannot derive 'GnomeControlCenter' from non-fundamental parent type 'CcShell'

(gnome-control-center.real:22243): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(gnome-control-center.real:22243): GLib-GObject-CRITICAL **: g_object_new: assertion 'G_TYPE_IS_OBJECT (object_type)' failed [1] 22243 segmentation fault (core dumped) gnome-control-center

please help

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