Hi Felix, thanks a lot, I added this service, but it didn't help. The same message appear in updating my config.scm file Am 01.11.22 um 19:30 schrieb Felix Lechner: > Hi Gottfried > > On Tue, Nov 1, 2022 at 11:26 AM Gottfried wrote: >> >> Error unbound variable in cups... > > For question #1: Do you need (use-modules (gnu services cups)) ? > > Kind regards > Felix Lechner -- Kind regards Gottfried