Ubuntu Cloud Archive

to support new releases of openstack on Ubuntu 12.04 LTS release.

official site from Ubuntu

How to Enable and Use

1, You'll first need to add the cloud archive gpg key into your ubuntu-keyring by running the following command:

sudo apt-get install ubuntu-cloud-keyring

2, Next, to get access to the Ubuntu Cloud archive, please add the following entries to your /etc/apt/sources.list: (Grizzly)

 # The primary updates archive that users should be using
 deb http://ubuntu-cloud.archive.canonical.com/ubuntu precise-updates/grizzly main

 # Public -proposed archive mimicking the SRU process for extended testing.
 # Packages should bake here for at least 7 days. 
 #deb  http://ubuntu-cloud.archive.canonical.com/ubuntu precise-proposed/grizzly main

Now run:

sudo apt-get update

to update your package listings and then proceed to install/upgrade your openstack packages.