Facing the same issue on Lubuntu 16.04 - 32 bit after upgrading from lubuntu 15.10. The issue seems to be with Light DM, Light Locker setting also not opening.
Facing the same issue on Lubuntu 16.04 - 32 bit after upgrading from lubuntu 15.10. The issue seems to be with Light DM, Light Locker setting also not opening.