Initial working config.

modules/hosts/desktop/configuration.nix

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+# Edit this configuration file to define what should be installed on
+# your system. Help is available in the configuration.nix(5) man page, on
+# https://search.nixos.org/options and in the NixOS manual (`nixos-help`).
+
+{ inputs, lib, pkgs, self, ... }:
+{
+flake.nixosModules.lily-desktop = { pkgs, ... }: {
+  imports = [    ];
+
+  # Use the systemd-boot EFI boot loader.
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  networking.hostName = "lily-desktop"; # Define your hostname.
+
+  # Configure network connections interactively with nmcli or nmtui.
+  networking.networkmanager.enable = true;
+
+# Set your time zone.
+	time.timeZone = "America/Chicago";
+
+# Select internationalisation properties.
+	i18n.defaultLocale = "en_US.UTF-8";
+
+	i18n.extraLocaleSettings = {
+		LC_ADDRESS = "en_US.UTF-8";
+		LC_IDENTIFICATION = "en_US.UTF-8";
+		LC_MEASUREMENT = "en_US.UTF-8";
+		LC_MONETARY = "en_US.UTF-8";
+		LC_NAME = "en_US.UTF-8";
+		LC_NUMERIC = "en_US.UTF-8";
+		LC_PAPER = "en_US.UTF-8";
+		LC_TELEPHONE = "en_US.UTF-8";
+		LC_TIME = "en_US.UTF-8";
+	};
+
+# Configure keymap in X11
+	services.xserver.xkb = {
+		layout = "us";
+		variant = "";
+	};
+
+  # Enable the X11 windowing system.
+  services.xserver.enable = true;
+
+
+  # Enable the GNOME Desktop Environment.
+  services.displayManager.gdm.enable = true;
+  services.desktopManager.gnome.enable = true;
+  
+  # Enable CUPS to print documents.
+  # services.printing.enable = true;
+
+  # Enable sound.
+  # services.pulseaudio.enable = true;
+  # OR
+  # services.pipewire = {
+  #   enable = true;
+  #   pulse.enable = true;
+  # };
+
+  # Enable touchpad support (enabled default in most desktopManager).
+  # services.libinput.enable = true;
+
+  # Define a user account. Don't forget to set a password with ‘passwd’.
+   users.users.lily = {
+     isNormalUser = true;
+     extraGroups = [ "wheel" "lily" ]; # Enable ‘sudo’ for the user.
+     packages = with pkgs; [
+       tree
+git
+	vim
+     ];
+   };
+users.groups.lily = { };
+   programs.firefox.enable = true;
+
+  # List packages installed in system profile.
+  # You can use https://search.nixos.org/ to find more packages (and options).
+  # environment.systemPackages = with pkgs; [
+  #   vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
+  #   wget
+  # ];
+
+  # Some programs need SUID wrappers, can be configured further or are
+  # started in user sessions.
+  # programs.mtr.enable = true;
+  # programs.gnupg.agent = {
+  #   enable = true;
+  #   enableSSHSupport = true;
+  # };
+
+  # List services that you want to enable:
+
+  # Enable the OpenSSH daemon.
+  # services.openssh.enable = true;
+
+  # Open ports in the firewall.
+  # networking.firewall.allowedTCPPorts = [ ... ];
+  # networking.firewall.allowedUDPPorts = [ ... ];
+  # Or disable the firewall altogether.
+  # networking.firewall.enable = false;
+
+  # Copy the NixOS configuration file and link it from the resulting system
+  # (/run/current-system/configuration.nix). This is useful in case you
+  # accidentally delete configuration.nix.
+  # system.copySystemConfiguration = true;
+
+	nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  # This option defines the first version of NixOS you have installed on this particular machine,
+  # and is used to maintain compatibility with application data (e.g. databases) created on older NixOS versions.
+  #
+  # Most users should NEVER change this value after the initial install, for any reason,
+  # even if you've upgraded your system to a new NixOS release.
+  #
+  # This value does NOT affect the Nixpkgs version your packages and OS are pulled from,
+  # so changing it will NOT upgrade your system - see https://nixos.org/manual/nixos/stable/#sec-upgrading for how
+  # to actually do that.
+  #
+  # This value being lower than the current NixOS release does NOT mean your system is
+  # out of date, out of support, or vulnerable.
+  #
+  # Do NOT change this value unless you have manually inspected all the changes it would make to your configuration,
+  # and migrated your data accordingly.
+  #
+  # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
+  system.stateVersion = "25.11"; # Did you read the comment?
+};
+}
+

modules/hosts/desktop/desktop.nix

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+{ inputs, lib, pkgs, self, ... }:
+{
+	flake.nixosConfigurations.lily-desktop = inputs.nixpkgs.lib.nixosSystem {
+		modules = [ 
+			self.nixosModules.lily-desktop
+		];
+	};
+}
+

modules/hosts/desktop/hardware-configuration.nix

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+{
+flake.nixosModules.lily-desktop = { config, lib, modulesPath, pkgs, self, ... }: {
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "ahci" "nvme" "usb_storage" "usbhid" "sd_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-amd" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/mapper/root";
+      fsType = "btrfs";
+      options = [ "subvol=@nixroot" ];
+    };
+
+  boot.initrd.luks.devices."root".device = "/dev/disk/by-uuid/8573b24b-461f-40bf-b16b-9de1207c0696";
+
+  fileSystems."/boot" =
+    { device = "/dev/disk/by-uuid/5598-7465";
+      fsType = "vfat";
+      options = [ "fmask=0022" "dmask=0022" ];
+    };
+
+  fileSystems."/home" =
+    { device = "/dev/mapper/root";
+      fsType = "btrfs";
+      options = [ "subvol=@home" ];
+    };
+
+  swapDevices = [ ];
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+};
+}