Hi, thanks for help I added this line in my config.scm --------------------------------------- (use-modules (gnu)) (use-modules (gnu services lightdm)) (use-package-modules cups scanner) (use-service-modules cups desktop networking ssh xorg virtualization) -------------------------------------- after running sudo guix system reconvigure.... it says: mistake: the service "xorg-server" appears more than one time. -------------------------------------------------- because gdm is also installed. So can I have both installed? kind regards Gottfried Am 12.05.23 um 17:20 schrieb Mario Forzanini: > > At the beginning of the file there should be a list of imported modules, > you should add something like > > > (use-modules (gnu services lightdm)) > > > Which is the Guile module in which the symbol `lightdm-service-type' is > defined, without that Guile won't know how to relate that symbol to any > meaningful value. > > If you want to find where a service is defined you could use the emacs > interface for Guix: typing 'M-x guix RET s a' gives you a list of > clickable service names, when you click on one of them useful info pops > up. There's probably a way to do it with the command-line interface, but > I'm not familiar with that. > > I hope this helps :) --