A U.S. appeals court overturned a pretrial sales ban against Samsung Electronics Co Ltd’s Galaxy Nexus smartphone, dealing a setback to Apple Inc in its battle against Google Inc’s increasingly popular mobile software. Apple is waging war on several fronts against Google, whose Android software powers many of Samsung’s devices. The ruling on Thursday from the U.S. Court of Appeals for the Federal Circuit is not expected to have an outsized impact on the smartphone market, as the Nexus is an aging product in Samsung’s lineup.