[MM3-users] No module named 'hyperkitty.urls' after upgrading python3

Ubuntu 20.04 python3 3.8.0-3 python3-django-hyperkitty: 1.3.2

Traceback (most recent call last):
  File "/usr/share/mailman3-web/manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/lib/python3/dist-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/usr/lib/python3/dist-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/lib/python3/dist-packages/django/core/management/base.py", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/lib/python3/dist-packages/django/core/management/base.py", line 361, in execute
    self.check()
  File "/usr/lib/python3/dist-packages/django/core/management/base.py", line 387, in check
    all_issues = self._run_checks(
  File "/usr/lib/python3/dist-packages/django/core/management/base.py", line 377, in _run_checks
    return checks.run_checks(**kwargs)
  File "/usr/lib/python3/dist-packages/django/core/checks/registry.py", line 72, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/usr/lib/python3/dist-packages/django/core/checks/urls.py", line 13, in check_url_config
    return check_resolver(resolver)
  File "/usr/lib/python3/dist-packages/django/core/checks/urls.py", line 23, in check_resolver
    return check_method()
  File "/usr/lib/python3/dist-packages/django/urls/resolvers.py", line 399, in check
    for pattern in self.url_patterns:
  File "/usr/lib/python3/dist-packages/django/utils/functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/usr/lib/python3/dist-packages/django/urls/resolvers.py", line 584, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/usr/lib/python3/dist-packages/django/utils/functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/usr/lib/python3/dist-packages/django/urls/resolvers.py", line 577, in urlconf_module
    return import_module(self.urlconf_name)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/etc/mailman3/django/urls.py", line 30, in <module>
    url(r'^hyperkitty/', include('hyperkitty.urls')),
  File "/usr/lib/python3/dist-packages/django/urls/conf.py", line 34, in include
    urlconf_module = import_module(urlconf_module)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'hyperkitty.urls'

# dpkg --contents python3-django-hyperkitty_1.3.2+b1-20.04_amd64.deb|grep urls
-rw-r--r-- root/staff     1356 2020-01-14 12:22 ./usr/local/lib/python3.7/dist-packages/HyperKitty-1.3.2-py3.7.egg/example_project/urls.py
-rw-r--r-- root/staff     1043 2020-01-14 12:22 ./usr/local/lib/python3.7/dist-packages/HyperKitty-1.3.2-py3.7.egg/hyperkitty/tests/urls_test.py
-rw-r--r-- root/staff     7783 2020-01-14 12:22 ./usr/local/lib/python3.7/dist-packages/HyperKitty-1.3.2-py3.7.egg/hyperkitty/urls.py
-rw-r--r-- root/root      1356 2019-09-01 02:56 ./usr/share/doc/python3-django-hyperkitty/examples/urls.py

No such issue with python3 3.7.5-3. Any suggestion?