Comment 31 for bug 1663485

The temporary workaround I am currently using is here:

https://review.openstack.org/#/c/443778/13/labs/osbash/scripts/ubuntu/setup_horizon.sh

I changed the owner for secret_key and the containing directory to www-data:www-data. It used to be horizon:horizon in Newton, but for Canonical's Ocata packages, that is no longer the case (and changing the owner to horizon does not help, either).