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{ pkgs, ... }: {

  services.xserver = {
    desktopManager.gnome.enable = true;
    displayManager.gdm.enable = true;
  };

  programs.gnupg.agent = {
    enable = true;
    enableSSHSupport = true;
    pinentryPackage = pkgs.pinentry-gnome3;
  };

  environment.systemPackages = with pkgs; [
    package_1
    package_2
    another_package
  ];

}