I am trying to install openstack Grizzly version. Before installing i will have to set the repository. i have configured repo as openstack suggested document echo deb http://ubuntu-cloud.archive.canonical.com/ubuntu precise-updates/grizzly main >> /etc/apt/sources.list.d/grizzly.list

Still i am getting essex 2012.1 version.

While executing apt-get update I get the following errors:

W: Failed to fetch gzip:/var/lib/apt/lists/partial/ubuntu-cloud.archive.canonical.com_ubuntu_dists_precise-updates_grizzly_main_binary-amd64_Packages  Hash Sum mismatch

W: Failed to fetch gzip:/var/lib/apt/lists/partial/ubuntu-cloud.archive.canonical.com_ubuntu_dists_precise-updates_grizzly_main_binary-i386_Packages  Hash Sum mismatch

W: Failed to fetch gzip:/var/lib/apt/lists/partial/ubuntu-cloud.archive.canonical.com_ubuntu_dists_precise-updates_grizzly_main_i18n_Translation-en%5fUS  Encountered a section with no Package: header

W: Failed to fetch gzip:/var/lib/apt/lists/partial/ubuntu-cloud.archive.canonical.com_ubuntu_dists_precise-updates_grizzly_main_i18n_Translation-en  Encountered a section with no Package: header

E: Some index files failed to download. They have been ignored, or old ones used instead.

Please guide me how to get Grizzly version by using manual commands (not devstack installation).