[CKEditor] ModuleNotFoundError: No module named 'django.core.urlresolvers'

No django 2.0, o reverse mudou de pacote.

Altere no arquivo [SEU_ENV]/lib/python3.6/site-packages/ckeditor_uploader/widgets.py a linha:

#from django.core.urlresolvers import reverse

Para:

from django.urls import reverse

hasta!