Публични ключове за Debian- apt

Понеже имам познати които незнаят как да фикснат грешките за неоткрити ключове при apt-get.
Дебиан
Дебиан

Дебиан
Ето го и съобщението:

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 9AA38DCD55BE302B
W: GPG error: http://ftp.bg.debian.org stable Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 9AA38DCD55BE302B NO_PUBKEY 4D270D06F42584E6
W: GPG error: http://security.debian.org etch/updates Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 9AA38DCD55BE302B
W: GPG error: http://ftp.bg.debian.org etch Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 9AA38DCD55BE302B
W: GPG error: http://http.us.debian.org stable Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 9AA38DCD55BE302B NO_PUBKEY 4D270D06F42584E6
W: You may want to run apt-get update to correct these problems

Ето го и решението:

apt-get install debian-archive-keyring