gdal-2.20
geos-3.6.2
proj-4.9.1
postgresql 10 with postgis 2.4
django 2

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.contrib.gis',

DATABASES = {
    'default': {
         'ENGINE': 'django.contrib.gis.db.backends.postgis',
         'NAME': 'geo',
         'USER': 'postgres',
         'PASSWORD': 'blah',
         'HOST': 'localhost',
         'PORT': '5432',

    }
}

python3 manage.py migrate I get this long error

 python3 manage.py makemigrations
/home/ralph/.local/lib/python3.6/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
  """)
Traceback (most recent call last):
  File "/home/ralph/.local/lib/python3.6/site-packages/django/db/utils.py", line 110, in load_backend
    return import_module('%s.base' % backend_name)
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/db/backends/postgis/base.py", line 6, in <module>
    from .features import DatabaseFeatures
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/db/backends/postgis/features.py", line 1, in <module>
    from django.contrib.gis.db.backends.base.features import BaseSpatialFeatures
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/db/backends/base/features.py", line 3, in <module>
    from django.contrib.gis.db.models import aggregates
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/db/models/__init__.py", line 3, in <module>
    import django.contrib.gis.db.models.functions  # NOQA
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/db/models/functions.py", line 3, in <module>
    from django.contrib.gis.db.models.fields import BaseSpatialField, GeometryField
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/db/models/fields.py", line 3, in <module>
    from django.contrib.gis import forms, gdal
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/forms/__init__.py", line 3, in <module>
    from .fields import (  # NOQA
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/forms/fields.py", line 2, in <module>
    from django.contrib.gis.geos import GEOSException, GEOSGeometry
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/geos/__init__.py", line 5, in <module>
    from .collections import (  # NOQA
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/geos/collections.py", line 9, in <module>
    from django.contrib.gis.geos.geometry import GEOSGeometry, LinearGeometryMixin
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/geos/geometry.py", line 8, in <module>
    from django.contrib.gis import gdal
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/gdal/__init__.py", line 28, in <module>
    from django.contrib.gis.gdal.datasource import DataSource
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/gdal/datasource.py", line 41, in <module>
    from django.contrib.gis.gdal.layer import Layer
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/gdal/layer.py", line 6, in <module>
    from django.contrib.gis.gdal.feature import Feature
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/gdal/feature.py", line 4, in <module>
    from django.contrib.gis.gdal.geometries import OGRGeometry, OGRGeomType
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/gis/gdal/geometries.py", line 52, in <module>
    from django.contrib.gis.geometry import hex_regex, json_regex, wkt_regex
ImportError: cannot import name 'hex_regex'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "/home/ralph/.local/lib/python3.6/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
    utility.execute()
  File "/home/ralph/.local/lib/python3.6/site-packages/django/core/management/__init__.py", line 347, in execute
    django.setup()
  File "/home/ralph/.local/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/ralph/.local/lib/python3.6/site-packages/django/apps/registry.py", line 112, in populate
    app_config.import_models()
  File "/home/ralph/.local/lib/python3.6/site-packages/django/apps/config.py", line 198, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/auth/models.py", line 2, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/home/ralph/.local/lib/python3.6/site-packages/django/contrib/auth/base_user.py", line 47, in <module>
    class AbstractBaseUser(models.Model):
  File "/home/ralph/.local/lib/python3.6/site-packages/django/db/models/base.py", line 114, in __new__
    new_class.add_to_class('_meta', Options(meta, app_label))
  File "/home/ralph/.local/lib/python3.6/site-packages/django/db/models/base.py", line 315, in add_to_class
    value.contribute_to_class(cls, name)
  File "/home/ralph/.local/lib/python3.6/site-packages/django/db/models/options.py", line 205, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "/home/ralph/.local/lib/python3.6/site-packages/django/db/__init__.py", line 33, in __getattr__
    return getattr(connections[DEFAULT_DB_ALIAS], item)
  File "/home/ralph/.local/lib/python3.6/site-packages/django/db/utils.py", line 202, in __getitem__
    backend = load_backend(db['ENGINE'])
  File "/home/ralph/.local/lib/python3.6/site-packages/django/db/utils.py", line 125, in load_backend
    ) from e_user
django.core.exceptions.ImproperlyConfigured: 'django.contrib.gis.db.backends.postgis' isn't an available database backend.
Try using 'django.db.backends.XXX', where XXX is one of:
    'mysql', 'oracle', 'postgresql', 'sqlite3'