TRIBUNE <TRB> COMPLETES CABLE SYSTEM SALE Tribune Co said it completed the sale of the Danville, Va., cable television system to Cablevision Industries Ltd Partnership, affiliated with Cablevision Industries Inc of Liberty, N.Y. It said the Danville system was one of two systems acquired by Tribune on September 30, 1986 as part of its purchase of The Daily Press Inc, publisher of the Newport News Daily Press and The Times-Herald. Agreements to sell both systems for a total of 100 mln dlrs were reached in October. Sale of the Newport News system was completed in December.