What version are you running?
ReviewBoard: 2.5.7

django-storages: 1.5.0

Ubuntu 16.04
What's the URL of the page containing the problem?
https://www.reviewboard.org/docs/manual/2.5/admin/installation/linux/
What steps will reproduce the problem?

Install ReviewBoard and django-storages with pip
Go to Admin panel and try to configure S3 storage

What is the expected output? What do you see instead?
It says django-storages is not installed.
Please provide any additional information below.
It works if you install django-storages 1.4.1 instead.
Recomending temporarly updating the documentation to pip install -U django-storages==1.4.1 while this gets fixed.