Whenever I receive upgraded packages from security.debian.org, I get the following error:
WARNING: The following packages cannot be authenticated! apache2 apache2-mpm-prefork apache2.2-common ... Install these packages without verification [y/N]? E: Some packages could not be authenticated
I'm running Debian 6 in an OpenVZ container. I have the following line in my /etc/apt/sources.list:
deb http://security.debian.org squeeze updates/main updates/contrib
I have debian-archive-keyring installed and up to date.