diff --git a/configuration.nix b/configuration.nix
index 8c93633..9d049e8 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -84,13 +84,14 @@ in
     LC_TELEPHONE = "en_GB.UTF-8";
     LC_TIME = "en_GB.UTF-8";
   };
-
-  # Enable the X11 windowing system.
-  services.xserver.enable = true;
-
-  # Enable the GNOME Desktop Environment.
-  # services.xserver.displayManager.gdm.enable = true;
-  # services.xserver.desktopManager.gnome.enable = true;
+  services.xserver = {
+    enable = true;
+    desktopManager = {
+      xterm.enable = false;
+      xfce.enable = true;
+    };
+    displayManager.defaultSession = "xfce";
+  };
 
   # Configure keymap in X11
   services.xserver = {
@@ -884,7 +885,6 @@ valign = bottom
 	mpv
 	killall
 	zip
-	xfce
   ];
 
   fonts.packages = with pkgs; [
diff --git a/nixos-switch.log b/nixos-switch.log
index 23fce41..2914484 100644
--- a/nixos-switch.log
+++ b/nixos-switch.log
@@ -1,25 +1,8 @@
 building Nix...
 building the system configuration...
-error:
-       … while calling the 'head' builtin
-
-         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:1575:11:
-
-         1574|         || pred here (elemAt values 1) (head values) then
-         1575|           head values
-             |           ^
-         1576|         else
-
-       … while evaluating the attribute 'value'
-
-         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:809:9:
-
-          808|     in warnDeprecation opt //
-          809|       { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
-             |         ^
-          810|         inherit (res.defsFinal') highestPrio;
-
-       (stack trace truncated; use '--show-trace' to show the full trace)
-
-       error: A definition for option `environment.systemPackages."[definition 1-entry 43]"' is not of type `package'. Definition values:
-       - In `/etc/nixos/configuration.nix'
+trace: warning: The option `services.xserver.displayManager.defaultSession' defined in `/etc/nixos/configuration.nix' has been renamed to `services.displayManager.defaultSession'.
+activating the configuration...
+setting up /etc...
+reloading user units for lightdm...
+reloading user units for deadvey...
+restarting sysinit-reactivation.target