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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

#apt-get update