guruuser@GRU01DBS01TEST:~$ sudo apt-key add 40976EAF437D05B5.pub.gpg
OK
guruuser@GRU01DBS01TEST:~$ sudo apt-key add 1054B7A24BD6EC30.pub.gpg
OK
guruuser@GRU01DBS01TEST:~$ sudo apt-get update
...
W: GPG error: http://gb.archive.ubuntu.com precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5
W: GPG error: http://gb.archive.ubuntu.com precise-updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5
W: GPG error: http://gb.archive.ubuntu.com precise-backports Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5
W: GPG error: http://security.ubuntu.com precise-security Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5
W: GPG error: http://apt.puppetlabs.com precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1054B7A24BD6EC30
W: Failed to fetch http://packages.atlasit.com/debian/dists/precise/ntteam/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.