Tømta has also stepped down as a director of the play, after deciding that the plays she is directing this spring and autumn, would leave her with insufficient time to do justice to Knausgård's work.
She has hired veteran director Kjetil Bang-Hansen to take her place.
"Dramatizing as extensive and complex work as Mr Struggle is a demanding exercise," Tømta said in a press release. "To make the performance as good as we want it to be, we need to put more time and more resources into the project. Therefore, we are postponing the premiere."