diff --git a/configuration.nix b/configuration.nix
index 659301a..bf219ce 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -10,6 +10,8 @@
       ./hardware-configuration.nix
     ];
 
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
   # Bootloader.
   boot.loader.grub.enable = true;
   boot.loader.grub.device = "/dev/sdc";
@@ -47,8 +49,12 @@
   services.xserver.enable = true;
 
   # Enable the XFCE Desktop Environment.
-  services.xserver.displayManager.lightdm.enable = true;
-  services.xserver.desktopManager.xfce.enable = true;
+  # services.xserver.displayManager.lightdm.enable = true;
+  # services.xserver.desktopManager.xfce.enable = true;
+
+  # Enable automatic login for the user.
+  # services.xserver.displayManager.autoLogin.enable = true;
+  # services.xserver.displayManager.autoLogin.user = "sondell";
 
   # Configure keymap in X11
   services.xserver = {
@@ -93,9 +99,6 @@
     ];
   };
 
-  # Enable automatic login for the user.
-  services.xserver.displayManager.autoLogin.enable = true;
-  services.xserver.displayManager.autoLogin.user = "sondell";
 
   # Allow unfree packages
   nixpkgs.config.allowUnfree = true;
@@ -123,6 +126,8 @@
 
   # Enable the OpenSSH daemon.
   services.openssh.enable = true;
+  services.openssh.settings.PasswordAuthentication = false;
+  # services.openssh.settings.PermitRootLogin = "proh";
 
   # Open ports in the firewall.
   # networking.firewall.allowedTCPPorts = [ ... ];