Hi, as mentioned on http://times.debian.net/1076, Debian Sarge r5 Release has been signed with a new key which is not in the keyring of the apt included in bpo. If you have any problems with the unknown key used in the Release file import the new key with apt-key: lynx --dump test http://times.debian.net/1076 | apt-key add - Thank Alex (bpo ftp-master)
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