Add configuration.nix

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
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+
+{ config, pkgs, ... }:
+
+{
+  imports =
+    [ # Include the results of the hardware scan.
+      ./hardware-configuration.nix
+    ];
+
+  # Bootloader.
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  networking.hostName = "nixos-usb"; # Define your hostname.
+  networking.networkmanager.enable = true;
+
+  # Set your time zone.
+  time.timeZone = "Europe/Berlin";
+
+  # Select internationalisation properties.
+  i18n.defaultLocale = "de_DE.UTF-8";
+
+  i18n.extraLocaleSettings = {
+    LC_ADDRESS = "de_DE.UTF-8";
+    LC_IDENTIFICATION = "de_DE.UTF-8";
+    LC_MEASUREMENT = "de_DE.UTF-8";
+    LC_MONETARY = "de_DE.UTF-8";
+    LC_NAME = "de_DE.UTF-8";
+    LC_NUMERIC = "de_DE.UTF-8";
+    LC_PAPER = "de_DE.UTF-8";
+    LC_TELEPHONE = "de_DE.UTF-8";
+    LC_TIME = "de_DE.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;
+
+  # Configure keymap in X11
+  services.xserver.xkb = {
+    layout = "de";
+    variant = "";
+  };
+
+  # Configure console keymap
+  console.keyMap = "de";
+
+  # Enable touchpad support
+  services.xserver.libinput.enable = true;
+
+  # Enable CUPS to print documents.
+  services.printing.enable = true;
+
+  # Enable sound with pipewire.
+  services.pulseaudio.enable = false;
+  security.rtkit.enable = true;
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+  };
+
+  # Define a user account.
+  users.users.user = {
+    isNormalUser = true;
+    description = "user";
+    extraGroups = [ "networkmanager" "wheel" ];
+    shell = pkgs.bash;
+    # Set password after first boot with: passwd user
+  };
+
+  # Allow unfree packages (required for Obsidian, etc.)
+  nixpkgs.config.allowUnfree = true;
+
+  # List packages installed in system profile.
+  environment.systemPackages = with pkgs; [
+    # Core utilities
+    vim
+    git
+    curl
+    wget
+    openssh  # for ssh/scp if needed
+
+    # Requested applications
+    obsidian
+    libreoffice
+    keepassxc
+    thunderbird
+    tor-browser
+    inkscape
+    gimp
+    pdfarranger
+
+    # GNOME & web apps
+    epiphany  # GNOME Web — can install web apps
+    gnomeExtensions.gsconnect
+    gnomeExtensions.dash-to-dock
+  ];
+
+  # Enable Firefox.
+  programs.firefox.enable = true;
+
+  # This value determines the NixOS release compatibility.
+  system.stateVersion = "25.11";
+}