If, at the time appointed for the sale, the marshal should be prevented from attending at the place appointed, or, being present, should deem it for the advantage of all concerned to postpone the sale for want of purchasers, or other sufficient cause, he shall postpone the sale giving notice of every adjournment by public proclamation made at the same time. The marshal for like causes may also adjourn the sale from time to time, not exceeding thirty days beyond the day at which the writ is made returnable, with the consent of the plaintiff, indorsed upon the writ and approved by the court.