Created attachment 12218 [details]
spec file

web-greeter thows an exception:
Traceback (most recent call last):
  File "/usr/lib/web-greeter/bridge/Greeter.py", line 259, in layouts
    return [layout_to_dict(layout) for layout in LightDM.get_layouts()]
  File "/usr/lib/web-greeter/bridge/Greeter.py", line 259, in <listcomp>q
    return [layout_to_dict(layout) for layout in LightDM.get_layouts()]
  File "/usr/lib/web-greeter/bridge/__init__.py", line 48, in layout_to_dict
    "short_description": layout.get_short_description()
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd0 in position 8: unexpected end of data

The issue is already fixed by owner (JezerM): https://github.com/JezerM/web-greeter/commit/10741cfb069c70ad62639bf6b6fb811612b05d22

So to continue to use web-greeter we need to update corrent 3.4.1 to 3.5.1 version.

But JezerM add usage of submodules for themes: https://github.com/JezerM/web-greeter-themes/tree/44283cafccece5366612301d927fe5628fe9eda1 
More over he add submodule inside thems: https://github.com/JezerM/nody-greeter-types/tree/4bf0196380384964984a52b6ef97b1e8f3161742
Aslo typescript is add so we need to add node-typescript as build requirement in the spec.

I've attach my versions of spec