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Openstack Mitaka: can not access dashboard

Hi all, I installed openstack in a two-node environment on ubuntu 14.04 following the guide:

Everything was good prior to installing dashboard. I could create provider network and launch a VM.

After installing dashboard I tried to access it: http://controller/horizon I only got "Internal Server Error" on the browser.

Here are some logs in /var/log/apache2/error.log:

[Thu Apr 21 14:04:06.877057 2016] [:info] [pid 19552:tid 140395806283520] mod_wsgi (pid=19552): Create interpreter 'controller|/horizon'. [Thu Apr 21 14:04:06.881281 2016] [core:trace1] [pid 19566:tid 140395728054016] util_script.c(601): [client] Status line from script 'django.wsgi': 200 Continue [Thu Apr 21 14:04:06.881491 2016] [:info] [pid 19552:tid 140395806283520] [remote] mod_wsgi (pid=19552, process='horizon', application='controller|/horizon'): Loading WSGI script '/usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi'. [Thu Apr 21 06:09:10.383992 2016] [:info] [pid 19552:tid 140395856639744] mod_wsgi (pid=19552): Daemon process deadlock timer expired, stopping process 'horizon'. [Thu Apr 21 06:09:10.384175 2016] [:info] [pid 19552:tid 140395945576320] mod_wsgi (pid=19552): Shutdown requested 'horizon'. [Thu Apr 21 06:09:15.384571 2016] [:info] [pid 19552:tid 140395584993024] mod_wsgi (pid=19552): Aborting process 'horizon'.

Looks like apache can't load "/usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi". I'm new for openstack and python. Would you please give me some hints on this issue?

Many thanks,