The critical message is because you're passing an invalid DBusGProxy to dbus_g_proxy_call.
If you want to do disk management stuff outside of the capabilities of GIO, then the library you want really is GDU
The critical message is because you're passing an invalid DBusGProxy to dbus_g_proxy_call.
If you want to do disk management stuff outside of the capabilities of GIO, then the library you want really is GDU