| Hi guys, I'm encountering this error while trying to update from lenny to squeeze I'm planning to migrate one of my server to squeeze. Below is the error W: GPG error: http://security.debian.org stable/updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AED4B06F473041FA W: You may want to run apt-get update to correct these problems Here's the sources.list deb http://ftp.us.debian.org/debian/ squeeze main deb-src http://ftp.us.debian.org/debian/ squeeze main deb http://security.debian.org stable/updates main contrib non-free |