title: "No installed app with label 'admin'" in empty Django 2.2 project
body: <p>I am starting a new project in Django 2.2 using the same commands as I always do:</p>
  
  <pre><code>python3 -m venv django-env
  . django-env/bin/activate
  pip install django
  django-admin startproject mysite
  cd mysite/
  python3 manage.py runserver 8080
  </code></pre>
  
  <p>This should result in a running Django site, ready to write some code. Unfortunately, now I'm getting a strange error:</p>
  
  <p><code>LookupError: No installed app with label 'admin'.</code></p>
  
  <p>Full traceback:</p>
  
  <pre><code>Watching for file changes with StatReloader
  Exception in thread Thread-1:
  Traceback (most recent call last):
    File "/usr/lib64/python3.6/threading.py", line 916, in _bootstrap_inner
      self.run()
    File "/usr/lib64/python3.6/threading.py", line 864, in run
      self._target(*self._args, **self._kwargs)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/utils/autoreload.py", line 54, in wrapper
      fn(*args, **kwargs)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/core/management/commands/runserver.py", line 109, in inner_run
      autoreload.raise_last_exception()
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/utils/autoreload.py", line 77, in raise_last_exception
      raise _exception[0](_exception[1]).with_traceback(_exception[2])
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/utils/autoreload.py", line 54, in wrapper
      fn(*args, **kwargs)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/__init__.py", line 24, in setup
      apps.populate(settings.INSTALLED_APPS)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/apps/registry.py", line 114, in populate
      app_config.import_models()
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/apps/config.py", line 211, in import_models
      self.models_module = import_module(models_module_name)
    File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "&lt;frozen importlib._bootstrap&gt;", line 994, in _gcd_import
    File "&lt;frozen importlib._bootstrap&gt;", line 971, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 955, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 665, in _load_unlocked
    File "&lt;frozen importlib._bootstrap_external&gt;", line 678, in exec_module
    File "&lt;frozen importlib._bootstrap&gt;", line 219, in _call_with_frames_removed
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/contrib/auth/models.py", line 2, in &lt;module&gt;
      from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/contrib/auth/base_user.py", line 47, in &lt;module&gt;
      class AbstractBaseUser(models.Model):
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/db/models/base.py", line 117, in __new__
      new_class.add_to_class('_meta', Options(meta, app_label))
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/db/models/base.py", line 321, in add_to_class
      value.contribute_to_class(cls, name)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/db/models/options.py", line 204, in contribute_to_class
      self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/db/__init__.py", line 28, in __getattr__
      return getattr(connections[DEFAULT_DB_ALIAS], item)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/db/utils.py", line 201, in __getitem__
      backend = load_backend(db['ENGINE'])
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/db/utils.py", line 110, in load_backend
      return import_module('%s.base' % backend_name)
    File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/db/backends/sqlite3/base.py", line 66, in &lt;module&gt;
      check_sqlite_version()
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/db/backends/sqlite3/base.py", line 63, in check_sqlite_version
      raise ImproperlyConfigured('SQLite 3.8.3 or later is required (found %s).' % Database.sqlite_version)
  django.core.exceptions.ImproperlyConfigured: SQLite 3.8.3 or later is required (found 3.7.17).
  
  Traceback (most recent call last):
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/apps/registry.py", line 155, in get_app_config
      return self.app_configs[app_label]
  KeyError: 'admin'
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "manage.py", line 21, in &lt;module&gt;
      main()
    File "manage.py", line 17, in main
      execute_from_command_line(sys.argv)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
      utility.execute()
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/core/management/__init__.py", line 375, in execute
      self.fetch_command(subcommand).run_from_argv(self.argv)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/core/management/base.py", line 323, in run_from_argv
      self.execute(*args, **cmd_options)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/core/management/commands/runserver.py", line 60, in execute
      super().execute(*args, **options)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/core/management/base.py", line 364, in execute
      output = self.handle(*args, **options)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/core/management/commands/runserver.py", line 95, in handle
      self.run(**options)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/core/management/commands/runserver.py", line 102, in run
      autoreload.run_with_reloader(self.inner_run, **options)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/utils/autoreload.py", line 579, in run_with_reloader
      start_django(reloader, main_func, *args, **kwargs)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/utils/autoreload.py", line 564, in start_django
      reloader.run(django_main_thread)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/utils/autoreload.py", line 272, in run
      get_resolver().urlconf_module
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/utils/functional.py", line 80, in __get__
      res = instance.__dict__[self.name] = self.func(instance)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/urls/resolvers.py", line 564, in urlconf_module
      return import_module(self.urlconf_name)
    File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "&lt;frozen importlib._bootstrap&gt;", line 994, in _gcd_import
    File "&lt;frozen importlib._bootstrap&gt;", line 971, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 955, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 665, in _load_unlocked
    File "&lt;frozen importlib._bootstrap_external&gt;", line 678, in exec_module
    File "&lt;frozen importlib._bootstrap&gt;", line 219, in _call_with_frames_removed
    File "/home/ec2-user/environment/mysite/mysite/urls.py", line 20, in &lt;module&gt;
      path('admin/', admin.site.urls),
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/utils/functional.py", line 256, in inner
      self._setup()
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/contrib/admin/sites.py", line 529, in _setup
      AdminSiteClass = import_string(apps.get_app_config('admin').default_site)
    File "/home/ec2-user/environment/django-env/lib64/python3.6/dist-packages/django/apps/registry.py", line 162, in get_app_config
      raise LookupError(message)
  LookupError: No installed app with label 'admin'.
  </code></pre>
  
  <p>However after downgrading version of Django with <code>pip install django==2.1.8</code></p>
  
  <p>Everything is back to normal and works as expected.</p>
  
  <p>I have looked at Django 2.2 release notes and list of backward incompatible changes and deprecated features and haven't found anything.
  Can anyone please shed some light as to what is happening?</p>