U.S. government debt prices gained Friday on investor fears that Greece could fail to form a government after Sunday elections, while weak U.S. economic data were also seen increasing pressure on the Federal Reserve to launch new bond purchases. Benchmark 10-year Treasury notes rose 17/32 in price to 101-21/32 with a yield of 1.59%, down 5 basis points from late on Thursday. Thirty-year bonds gained a point in price to yield 2.69%, down from