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About a year ago, I was able to add the verification key for the Hudson Debian package to apt by retrieving it from http://hudson-ci.org/debian/hudson-ci.org.key There is no file at that location. It seems this was reported in the old Hudson bug tracker - http://issues.hudson-ci.org/browse/HUDSON-8741 Without the public key, it's necessary to force apt to install the unverified package.
Winston Prakash responded earlier to a forum post: http://www.eclipse.org/forums/index.php/t/376051/