Why: Unable to install some cloud related packages from a Ubuntu repository even as we have specifically added the repository
#echo “deb http://ubuntu-cloud.archive.canonical.com/ubuntu precise-updates/grizzly main” >> /etc/apt/sources.list.d/cloud-archive.list
Simply adding the repo does not work, we must also have a valid public key available, for these packages to get installed. OS verifies the originality of the packages by using the public key.
SOlution: Install the key manually from the CLI as
#apt-get adv –recv-keys –keyserver keyserver.ubuntu.com 5EDB1B62EC4926EA