I am new to django and currently I am making the tutorial. It goes well but every time at some point my admin site loses ist CSS styling and starts looking like this:

This problem is apparently not new, as I found few posts here (e.g., this one or this one) on the topic. Following the answers I made the next steps:
- Running
python manage.py collectstatic Modifying
settings.py:STATIC_URL = '/static/' STATIC_ROOT = os.path.join(BASE_DIR, 'static')Adding the following lines to
manage.py:import mimetypes mimetypes.init() mimetypes.types_map['.css'] = 'text/css'Going sure that
'django.contrib.staticfiles'insettings.pyis uncommented.
Nevertheless, nothing worked and my admin site still does not have CSS styling.
Note that in my case the problem is not consistent. Whenever I start a new project, the admin page is fine. The problem appears only after certain (and each time different) step throughout the tutorial. For example, last time it was after I modified the DATABASES entry in settings.py (though I went through this step smoothly one attempt before; changing the entry to its original value did not help to restore the admin page styling).
I am using django 1.9.6 with python 3.4.3 under Ubuntu 14.04.
EDIT:
I am running server with #DEBUG = True and ALLOWED_HOSTS = ['*']