[root@treeroot:/etc/nixos]# nixos-rebuild boot
error: 'flake' is not a recognised command
Try 'nix --help' for more information.

{
  nix = {
    package = pkgs.nixFlakes;
    extraOptions = ''
      experimental-features = nix-command flakes
    '';
  };
}

{
  description = "description";

  edition = 201909;

  inputs = {
    nixpkgs = {
      type = "github";
      owner = "NixOS";
      repo = "nixpkgs-channels";
      ref = "nixpkgs-unstable";
    };
  };

  outputs = { nixpkgs, ... }: {
    nixosConfigurations.hostname = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules = [ (import ./configuration.nix) ];
    };
  };
}

{
  config, 
  pkgs,
  ...
}:
{
  imports = [
    <nixpkgs/nixos/modules/installer/cd-dvd/installation-cd-graphical-plasma5-new-kernel.nix>

    # Provide an initial copy of the NixOS channel so that the user
    # doesn't need to run "nix-channel --update" first.
    <nixpkgs/nixos/modules/installer/cd-dvd/channel.nix>
  ];
  
  nix = {
    package = pkgs.nixFlakes;
    extraOptions = ''
      experimental-features = nix-command flakes
    '';
  };
  
  boot.extraModulePackages = with config.boot.kernelPackages; [
  (rtlwifi_new.overrideAttrs (attrs: {
    src = pkgs.fetchzip {
      url = "https://github.com/lwfinger/rtlwifi_new/archive/a4cf600e0c65fe7bad51a61301156650124e27b5.zip";
      sha256 = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
    };
  }))
  ];
  
  boot.extraModprobeConfig = "options rtl8723de ant_sel=2";
  boot.loader.grub.forcei686 = true;
  
  services.xserver.desktopManager.lxqt.enable = true;
  services.xserver.displayManager.defaultSession = "lxqt";
  
  environment.systemPackages = with pkgs; [ 
  grub2_full 
  grub2
  firefox
  mc
  ];
}