Suddenly My Ubuntu 16.04 LTS giving me a issue, I can't open files manger as well as screenshots app. So I dig into the problem and found this temporary solution for file manager. Still searching for permanent solution. Ubuntu is very buggy since and then, not stable any way. Step 1 : @jpudasaini:~$ nautilus -q (nautilus:6210): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed (nautilus:6210): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed (nautilus:6210): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion 'GDK_IS_SCREEN (screen)' failed (nautilus:6210): GLib-GObject-WARNING **: invalid (NULL) pointer instance (nautilus:6210): GLib-GObject-CRITICAL **: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Step 2 : jpudasaini@jpudasaini:~$ nautilus Nautilus-S...