Nova compute install problem on ubuntu: you have held broken packages.

Trying to follows steps from the following URL and below errors. Appreciate any alternative folsom install pointers.
http://docs.openstack.org/trunk/openstack-compute/install/apt/content/installing-the-cloud-controller.html

root@ubuntu:~# apt-get -y install nova-common nova-compute nova-volume nova-vncproxy nova-api nova-ajax-console-proxy nova-cert nova-consoleauth nova-doc nova-scheduler nova-network
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 nova-vncproxy : Depends: nova-common (= 2012.2+git201209200431~precise-0ubuntu1) but 2012.2+git201209250431~precise-0ubuntu1 is to be installed
E: Unable to correct problems, you have held broken packages.
root@ubuntu:~#