anchor.diff:  
     src = fetchurl {
       url = "https://launchpad.net/ubuntu/+archive/primary/+files/kmod_${version}.debian.tar.xz";
  -    sha256 = "1k749g707ccb82l4xmrkp53khl71f57cpj9fzd1qyzrz147fjyhi";
  +    sha256 = "sha256-K8tWpaLmCm3Jcxw3OZ+D7Koiug7epooRn1YMfqjGAiw=";
     };
   
     installPhase = ''
  
positive.code:   '';
  
    meta = with lib; {
      homepage = "https://packages.ubuntu.com/source/zesty/kmod";
      description = "Linux kernel module blacklists from Ubuntu";
      platforms = platforms.linux;
      license = with licenses; [ gpl2Plus lgpl21Plus ];
  
negative.code: { lib, stdenv, fetchurl, gnugrep, findutils }:
  
  let
    version = "28-1ubuntu4"; # impish 2021-06-24
  
  in stdenv.mkDerivation {
    pname = "kmod-blacklist";
  