anchor.diff:    services = {
       dbus.packages = [ pkgs.blueman ];
       locate.enable = true;
  -    gnome3.gnome-keyring.enable = true;
  +    gnome3 = {
  +      at-spi2-core.enable = true; # https://github.com/NixOS/nixpkgs/pull/15365#issuecomment-218451375
  +      gnome-keyring.enable = true;
  +      seahorse.enable = true;
  +    };
   
       printing = {
         enable = true;
  
positive.code:   security = {
      apparmor.enable = true;
      sudo.enable = true;
      polkit.extraConfig = ''
        // Allow wheel users to mount filesystems
        polkit.addRule(function(action, subject) {
  
negative.code:     };
    };
  
    virtualisation.virtualbox.host.enable = true;
  
    environment.systemPackages = with pkgs; [
      alsaLib
      alsaTools
  