I'm trying to upgrade a Debian Etch box to Lenny. I've opened /etc/apt/sources.list, did a global replace etch->lenny. Then I did "apt-get update" as root. After some activity, I got the following message:
W; GPG error: http://security.debian.org
lenny/updates Release: the following signatures couldn't be verified because the public key is not available: NO_PUBKEY xxxxxxxxxxxxx
And then another error of the same nature for the different, FTP site. Then it said I might to run apt-get update to correct that.
Any ideas, please? Where would I get a public key?