apt-get update reports GPG errors
Debian has deployed new keys to sign their packages and lists, to solve the error you need the latest version of "debian-archive-keyring". upgrade that package.
# apt-get install debian-archive-keyring
Debian has deployed new keys to sign their packages and lists, to solve the error you need the latest version of "debian-archive-keyring". upgrade that package.
# apt-get install debian-archive-keyring