public key is not available

["Paul J. Lucas" <pauljlucas@mac.com>]

	Recently, I started getting the error mail as shown below.  I
	did run apt-get and it didn't fix it.

	How can I fix this?  (I've tried different package mirrot
	sites.)

	- Paul

---------- Forwarded message ----------
Date: Wed, 18 Jan 2006 06:25:53 -0800
From: Cron Daemon <root@itsy.pauljlucas.org>
To: root@itsy.pauljlucas.org
Subject: Cron <root@itsy> test -x /usr/sbin/anacron || run-parts --report
    /etc/cron.daily

/etc/cron.daily/apt-update:
W: GPG error: http://debian.cites.uiuc.edu testing Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 010908312D230C5F
W: You may want to run apt-get update to correct these problems