Problems with apt-get update

[Joseph A. Nagy, Jr.]

W: GPG error: http://http.us.debian.org stable Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY B629A24C38C6029A
W: GPG error: http://non-us.debian.org stable/non-US Release: The 
following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY B629A24C38C6029A
W: GPG error: http://non-us.debian.org testing/non-US Release: The 
following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY B629A24C38C6029A
W: GPG error: http://non-us.debian.org unstable/non-US Release: The 
following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY B629A24C38C6029A
W: You may want to run apt-get update to correct these problems

What's going on here? I can't do anything (at least not without 
commenting out those sources) with apt-get because of this problem.
--
Joseph A. Nagy, Jr.
Student at Motlow State Community College
Political Activist Extrodinaire
The only fallacy is the inaction on our part to stave off the worst of 
horrors, the stripping of personal freedom.

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