A KeyServer is a server which processes and contains PGP keys.

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W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available:

I get the following error when i do sudo apt-get update W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: ...
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No gpg key from behind a firewall

Just stumbled over this closed thread here: GPG Error while running apt-get Same problem here, Ubuntu 12.04 behind a firewall and proxy. I dont think that matter is duplicate of the given topic. So ...
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When I try to add repositories, why are ubuntu's keyservers timing-out?

Something is rendering receiving keys from keyserver.ubuntu.com impossible and I'm not even sure where to begin in trying to resolve this. As an example, we'll use the Spotify linux app found here: ...