What was found
AT FL 260 PACK NR 2 VALVE FAILED. APPROX 10 SECONDS LATER, PACK NR 1 FAILED CABIN PRESSURE WAS 4600' BLEED AIR SUPPLY CONFIRMED GOOD ON ECAM. RESET BOTH PACK VALVES AND BOTH REMAINED FAULTED, CABIN PRESSURE CLIMBED TO 6800' COMPLIED WITH ECAM & QRH AND STARTED DESCENT TO 10,000' APU WAS RUNNING, APU BLEED WAS ON. DURING CLIMB OUT PACK NR 2 WAS SELECTED OFF WHEN THE WING ANTI-ICE WAS SELECTED ON. AT 16000' FT WE WERE ABLE TO RESET PACK NR 2 & THEN PACK NR 1. PERFORMED PNEUMATIC SYSTEM OPERATIONAL CHECK WITH NR 2 ENGINE BLEED AIR SOURCE REF AMM 36-11-00-05-0, OPS CHECK NORMAL.