Trying to package a .deb file

Help
1

Greetings !

I am trying to package a .deb file from an open-source application as an exercise to improve my Nix-fu. I know the CLI version of the app exist in Nixpkgs.

Following the wiki, I have arrived at a point where no library in any of the shared library or executable is not found with this default.nix :

Source code for default.nix 
{ lib
, stdenv
, makeDesktopItem
, fetchurl
, dpkg
, pkgs
, alsaLib
, atk
, at_spi2_core
, cairo
, cups
, dbus_daemon
, expat
, xorg_sys_opengl
, gtk3-x11
, gdk-pixbuf
, glib
, nspr
, nss_3_53
, nssTools
, nwjs
, ffmpeg
, gnome2
, utillinux
, libuuid
, xlibs
, libsecret
, libgnome-keyring
, fontconfig
, wrapGAppsHook
, makeWrapper
, autoPatchelfHook
}:
let
  desktopItem = makeDesktopItem {
    type = "Application";
    name = "OnlyKey";
    desktopName = "OnlyKey";
    exec = "$out/opt/OnlyKey/nw";
    icon = "$out/opt/OnlyKey/icon.png";
  };
  inputs = [
    alsaLib
    at_spi2_core
    atk
    cairo
    cups.lib
    dbus_daemon.lib
    ffmpeg
    gdk-pixbuf
    glib
    gnome2.pango
    gtk3-x11
    libgnome-keyring
    libsecret
    nspr
    nss_3_53
    utillinux
    xlibs.libX11
    xlibs.libXScrnSaver
    xlibs.libXcomposite
    xlibs.libXcursor
    xlibs.libXdamage
    xlibs.libXfixes
    xlibs.libXi
    xlibs.libXrandr
    xlibs.libXrender
    xlibs.libXtst
    xlibs.libxcb
    xorg_sys_opengl
  ];
in
stdenv.mkDerivation rec {
  pname = "OnlyKey";
  version = "5.3.3";

  src = fetchurl {
    url = "https://github.com/trustcrypto/OnlyKey-App/releases/download/v${version}/OnlyKey_${version}_amd64.deb";
    sha256 = "0qwf01v91b71xbmyndzzr1b7jxmym1x2kn9x8m4iwq6bwwwi2q8h";
  };

  buildInputs = [
    dpkg
    makeWrapper
    wrapGAppsHook
    autoPatchelfHook
  ] ++ inputs;

  runtimeDependencies = [ fontconfig.lib ];

  dontBuild = true;
  dontConfigure = true;

  unpackPhase = ''
    dpkg-deb -x $src .
  '';

  installPhase = ''
    mkdir -p $out/share
    cp -r ./opt $out
    cp -r "${desktopItem}/share/applications" "$out/share"
  '';
}

But, of course, when launching the binary with ./result/opt/OnlyKey/nw, I am greeted with

[3108436:3108443:0611/083318.158433:FATAL:udev_loader.cc(38)] Check failed: false.
#0 0x7fba9a2f1d1f <unknown>

[3108463:3108463:0611/083318.285342:ERROR:sandbox_linux.cc(366)] InitializeSandbox() called with multiple threads in process gpu-process.
[3108463:3108463:0611/083845.832143:ERROR:broker_posix.cc(43)] Invalid node channel message

and a non-responding terminal (I can only open a new session and kill the proccess). The second error seems to be known in chromium, the last one printing only when killing the process and the first one is leaving me clueless.

As far as I understand, it is some kind of Electron app using the library nwjs.

Here is a strace of the app launching.

Would anyone have an idea or faced a similar issue ?