I'm following this guide to install openstack on ubuntu 12.04: http://docs.openstack.org/grizzly/basic-install/apt/content/basic-install_controller.html#basic-install_controller-cinder

when I try to install the cinder packages I get the following error message:

Blockquote The following packages have unmet dependencies: cinder-volume : Depends: tgt but it is not going to be installed E: unable to correct problems, you have held broken packages

I have the default repos configured plus: deb http://archive.gplhost.com/debian grizzly main deb http://archive.gplhost.com/debian grizzly-backports main deb http://ubuntu-cloud.archive.canonical.com/ubuntu precise-updates/grizzly main

Did someone had this error before? do I have to add another repository?