I have installed OpenStack havana version and the packstack (without neutron). OK, the dashboard works fine.
My question is: Where have been installed the source code of horizon?
I mean, I found source code of dashboard under the /usr/share/openstack directory, but I don't know where is the Horizon's code, concretely, source code relative to web pages that is showed on dashboard website.
Ok, I respond my own question.
Horizon is installed at /usr/lib/pythonX.X/site-packages/horizon directory.
All the other componentes are installed under the /usr/lib/pythonX.X/site-packages/ directory.