我有一个捕获 22 试图：
# apt-get update
[... good lines omitted]
W: GPG error: http://backports.debian.org lenny-backports Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AED4B06F473041FA
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 AED4B06F473041FA
W: GPG error: http://ftp.us.debian.org lenny Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AED4B06F473041FA
在http://wiki.debian.org/SecureApt#Other_problems 上，它指出 NO_PUBKEY 问题“意味着存档已开始由新密钥签名，您的系统不知道该密钥......一旦系统被输入新密钥（通过升级 debian-archive-keyring …