anchor.diff:        };
       };
     };
  +
  +  security.pam.services.lightdm.enableGnomeKeyring = true;
   
     time.timeZone = "Europe/London";
   
  
positive.code:   };
  
    services = {
      gnome3.chrome-gnome-shell.enable = true;
      physlock.enable = true;
      fwupd.enable = true;
  
  
negative.code: { config, pkgs, ... }:
  
  let
    unstableTarball = fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz;
  in
  {
    imports =
  