Aircraft AP-BBF ( okker) F-27 was flying on a scheduled flight from Bhawalpur to Sukkur. While landing at Sukkur, when the landing gears were selected down, unsafe gear indication of nose gear appeared in the Cockpit. The Pilot recycled the gear& but the unsafe nose gear warning remained on. The Pilot tried lowering the gears by emergency method but the indication of unsafe nose gear persisted.