Make use of lightdm XFCE-specific

profiles/environment/graphical-environment.nix

@@ -36,12 +36,6 @@ packages: {config, ...}: {
             enable = true;
             layout = "us";
             xkbOptions = "eurosign:e, caps:backspace";
-
-            displayManager = {
-                lightdm = {
-                    enable = true;
-                };
-            };
         };
 
         # We need accounts-daemon for lightdm to work correctly.

profiles/environment/xfce4.nix

@@ -32,7 +32,8 @@ packages: {config, ...}: {
     ];
 
     services = {
-        xserver.desktopManager.xfce = {
+        xserver = {
+            desktopManager.xfce = {
                 enable = true;
                 thunarPlugins = with packages; [
                     nixpkgs.xfce.thunar-archive-plugin
@@ -40,6 +41,11 @@ packages: {config, ...}: {
                 ];
             };
 
+            displayManager.lightdm = {
+                enable = true;
+            };
+        };
+
         udisks2 = {
             enable = true;
         };