An Austrian Airlines de Havilland Dash 8-400, registration OE-LGI performing flight OS-917 from Vienna to Salzburg (Austria) with 56 people on board, was enroute at FL140 about 60nm eastsoutheast of Linz (Austria) when the crew decided to divert to Linz due to problems with the cabin pressure. The aircraft landed safely in Linz about 20 minutes later. The passengers were bussed to Salzburg. The return flight was cancelled. The airline reported maintenance is checking the aircraft, it was unclear whether there was a real loss of cabin pressure or whether there was just an indication problem. The occurrence aircraft positioned back to Vienna at 9000 feet, but has not yet resumed service about 10 hours after landing in Linz.