use a different polkit agent, module

modules/desktop/hyprland.nix

@@ -217,7 +217,6 @@ in {
 
         exec-once = [
           "${lib.getExe pkgs.networkmanagerapplet}"                          # network applet
-          "${pkgs.polkit_gnome}/libexec/polkit-gnome-authentication-agent-1" # polkit agent
           "${lib.getExe pkgs.wl-clip-persist} --clipboard regular"           # to fix wl clipboards disappearing
         ];
 

modules/desktop/mate-polkit.nix

@@ -0,0 +1,31 @@
+{ lib, config, pkgs, ...  }:
+
+with lib;
+let
+  cfg = config.modules.desktop.mate-polkit;
+in {
+  options.modules.desktop.mate-polkit = {
+    enable = mkEnableOption "Enable the MATE desktop environment polkit authentication agent";
+  };
+
+  config = mkIf cfg.enable {
+    hm.systemd.user.services.mate-polkit = {
+      Unit = {
+        Description = "the MATE desktop environment polkit authentication agent";
+        After = [ "graphical-session-pre.target" ];
+        PartOf = [ "graphical-session.target" ];
+      };
+
+      Install = {
+        WantedBy = [ "graphical-session.target" ];
+      };
+
+      Service = {
+        Type = "simple";
+        ExecStart = "${pkgs.mate.mate-polkit}/libexec/polkit-mate-authentication-agent-1";
+        Restart = "on-failure";
+        RestartSec = 5;
+      };
+    };
+  };
+}