导入gpg解决gpg error - Moose W. Oler的日志

引言：当使用非官方debian源的时候，会出现gpg error的问题。

今天添加了compiz-fusion的源，想安装emerald包（官方源里木有）
将

deb http://download.tuxfamily.org/shames/debian-lenny/desktopfx/unstable/ ./

添加到source.list，然后apt-get update，部分输入如下所示：

Get:1 http://download.tuxfamily.org ./ Release.gpg [197B]
Ign http://download.tuxfamily.org ./ Translation-en_US
Get:2 http://download.tuxfamily.org ./ Release [956B]
Ign http://download.tuxfamily.org ./ Release
Get:3 http://download.tuxfamily.org ./ Packages [9887B]
Fetched 11.0kB in 41s (264B/s)
Reading package lists... Done
W: GPG error: http://download.tuxfamily.org ./ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 73E6B0FAA42A6CF5
W: You may want to run apt-get update to correct these problems

据说有多种方法可以解决这个问题，下面只介绍一种方法：
1）倒数第二行的73E6B0FAA42A6CF5（红色以强调）即为缺失的公钥，使用如下命令获得公钥：

gpg --keyserver pgp.mit.edu --recv-keys 73E6B0FAA42A6CF5

公钥服务器可更换为其他，如wwwkeys.eu.pgp.net，视自己的网络状况决定。
获得公钥后的输出如下：

Juno:/etc/apt# gpg --keyserver pgp.mit.edu --recv-keys 73E6B0FAA42A6CF5
gpg: requesting key A42A6CF5 from hkp server pgp.mit.edu
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key A42A6CF5: public key "shame (beryl repository) <shame@sidux>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1

2）将公钥导入apt

gpg --armor --export 73E6B0FAA42A6CF5 | apt-key add -

3）再次运行apt-get update