Granit Xhaka opened the scoring after 12 minutes when David De Gea appeared to be deceived by his swerving long-range shot, with Aubameyang sealing the points from the spot after the break.
The Gunners had shown their attacking intent in the opening moments, SeadKolasinac’s cross just eluding Alexandre Lacazette.
Alexandre Lacazette’s strike partner Aubameyang was soon into the action, shooting over, but United clicked into gear and hit the bar when Luke Shaw foundBack came United as the open start continued, Fred’s strike beating Bernd Leno but coming back off the post, and at the other end Aaron Ramsey scooped over after a neat build-up.
Alexandre Lacazette’s powerful shot cannoned to safety off Chris Smalling as the home side looked for a second before Pogba curled an ambitious long-range strike into Leno’s gloves.
The Gunners threatened on the half-hour, Aubameyangfizzing the ball across goal, but United responded as Lukaku tried to find Fred after Leno had blocked his shot but the home side cleared.