---

nix.settings = {
    substituters = [
      "https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store"
      "https://cache.nixos.org"
    ];
    trusted-public-keys = [
      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
    ];
  };
sudo nixos-install --option substituters "https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store"
sudo nixos-install