Debian更新时候出现“GPG error The following ...

Debian更新时候出现“GPG error The following signatures couldn’t be verified because the public key is not available”错误 apt-get update时出现错误，如下：

W: GPG error: lenny-proposed-updates Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY AED4B06F473041FA

这个是由于PGP证书的问题，如下解决：

http://www.coder4.com
gpg --keyserver wwwkeys.pgp.net --recv-keys AED4B06F473041FA
gpg -a --export AED4B06F473041FA |apt-key add -

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