Lynn fought back, eroding the Swedish driver's advantage and closing to within 0.3s. Erkisson was equal to it however, and held on to claim his maiden GP3 Series victory from a disappointed Lynn.
Marvin Kirchhofer (ART) beat Lynn's team-mate Emil Bernstorff to the final podium spot, with Nick Yelloly (Status) fifth. Riccardo Agostini (Hilmer) was next across the line, while Richie Stanaway (Status) took seventh and Dino Zamparelli (ART) secured reverse grid pole in eighth.
But the Bristol-born racer would not convert that into home victory come Sunday morning's Sprint Race. His start was poor and Stanaway wasted no time in snatching the lead, with Bernstorff, Yelloly and Kirchhofer all following him past a crestfallen Zamparelli.
Yelloly grabbed second on lap two, but he never closed sufficiently on team-mate Stanaway who took his second GP3 win - nearly three years after his first triumph. Yelloly completed a memorable one-two for Silverstone-based squad Status, while Bernstorff made it two Brits on the podium in third.
Kirchhofer was several seconds down the road in fourth, ahead of Agostini and Lynn. The Brit recorded his first Sprint Race points of the season despite a slow start, making amends with some incisive passes. Zamparelli and Matheo Tuscher completed the points.
Lynn still leads the standings with an eight point advantage over Eriksson. Stanaway is now third, a further 10 behind the Swede, with Bernstorff and Kirchhofer completing the top five.