Linux之Debian执行apt-get update提示”没有可用的公钥”解决方法

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root@LookBack:~# apt-get update
命中 http://mirrors.aliyun.com wheezy Release.gpg
命中 http://mirrors.aliyun.com wheezy-proposed-updates Release.gpg
命中 http://mirrors.aliyun.com wheezy Release
命中 http://mirrors.aliyun.com wheezy-proposed-updates Release
命中 http://mirrors.aliyun.com wheezy/main Sources
命中 http://mirrors.aliyun.com wheezy/non-free Sources
命中 http://mirrors.aliyun.com wheezy/contrib Sources
命中 http://mirrors.aliyun.com wheezy/main amd64 Packages
命中 http://mirrors.aliyun.com wheezy/non-free amd64 Packages
命中 http://mirrors.aliyun.com wheezy/contrib amd64 Packages
命中 http://mirrors.aliyun.com wheezy/contrib Translation-en
命中 http://mirrors.aliyun.com wheezy/main Translation-zh_CN
命中 http://mirrors.aliyun.com wheezy/main Translation-zh
命中 http://mirrors.aliyun.com wheezy/main Translation-en
命中 http://mirrors.aliyun.com wheezy/non-free Translation-en
获取：1 http://mirrors.aliyun.com wheezy-proposed-updates/main Sources/DiffIndex [7,819 B]
获取：2 http://mirrors.aliyun.com wheezy-proposed-updates/non-free Sources/DiffIndex [3,541 B]
获取：3 http://mirrors.aliyun.com wheezy-proposed-updates/contrib Sources/DiffIndex [1,333 B]
获取：4 http://mirrors.aliyun.com wheezy-proposed-updates/main amd64 Packages/DiffIndex [7,819 B]
获取：5 http://mirrors.aliyun.com wheezy-proposed-updates/non-free amd64 Packages/DiffIndex [3,541 B]
获取：6 http://mirrors.aliyun.com wheezy-proposed-updates/contrib amd64 Packages/DiffIndex [1,195 B]
获取：7 http://mirrors.aliyun.com wheezy-proposed-updates/contrib Translation-en/DiffIndex [1,333 B]
获取：8 http://mirrors.aliyun.com wheezy-proposed-updates/main Translation-en/DiffIndex [7,819 B]
获取：9 http://mirrors.aliyun.com wheezy-proposed-updates/non-free Translation-en/DiffIndex [3,403 B]
下载 37.8 kB，耗时 1秒 (33.0 kB/s)         
正在读取软件包列表... 完成
W: 以下 ID 的密钥没有可用的公钥：
7638D0442B90D010
W: 以下 ID 的密钥没有可用的公钥：
7638D0442B90D010

root@LookBack:~# apt-get install debian-keyring debian-archive-keyring
正在读取软件包列表... 完成
正在分析软件包的依赖关系树       
正在读取状态信息... 完成       
下列【新】软件包将被安装：
  debian-keyring
下列软件包将被升级：
  debian-archive-keyring
升级了 1 个软件包，新安装了 1 个软件包，要卸载 0 个软件包，有 7 个软件包未被升级。
需要下载 45.4 MB 的软件包。
解压缩后会消耗掉 50.3 MB 的额外空间。
获取：1 http://mirrors.aliyun.com/debian/ wheezy/main debian-archive-keyring all 2014.3~deb7u1 [60.7 kB]
获取：2 http://mirrors.aliyun.com/debian/ wheezy/main debian-keyring all 2013.04.21 [45.4 MB]
下载 45.4 MB，耗时 21秒 (2,092 kB/s)                                                                                  
(正在读取数据库 ... 系统当前共安装有 20082 个文件和目录。)
正预备替换 debian-archive-keyring 2012.4 (使用 .../debian-archive-keyring_2014.3~deb7u1_all.deb) ...
正在解压缩将用于更替的包文件 debian-archive-keyring ...
正在设置 debian-archive-keyring (2014.3~deb7u1) ...
Selecting previously unselected package debian-keyring.
(正在读取数据库 ... 系统当前共安装有 20085 个文件和目录。)
正在解压缩 debian-keyring (从 .../debian-keyring_2013.04.21_all.deb) ...
正在设置 debian-keyring (2013.04.21) ...

root@LookBack:~# apt-get update
命中 http://mirrors.aliyun.com wheezy Release.gpg
命中 http://mirrors.aliyun.com wheezy-proposed-updates Release.gpg
命中 http://mirrors.aliyun.com wheezy Release
命中 http://mirrors.aliyun.com wheezy-proposed-updates Release
命中 http://mirrors.aliyun.com wheezy/main Sources
命中 http://mirrors.aliyun.com wheezy/non-free Sources
命中 http://mirrors.aliyun.com wheezy/contrib Sources
命中 http://mirrors.aliyun.com wheezy/main amd64 Packages
命中 http://mirrors.aliyun.com wheezy/non-free amd64 Packages
命中 http://mirrors.aliyun.com wheezy/contrib amd64 Packages
命中 http://mirrors.aliyun.com wheezy/contrib Translation-en
命中 http://mirrors.aliyun.com wheezy/main Translation-zh_CN
命中 http://mirrors.aliyun.com wheezy/main Translation-zh
命中 http://mirrors.aliyun.com wheezy/main Translation-en
命中 http://mirrors.aliyun.com wheezy/non-free Translation-en
命中 http://mirrors.aliyun.com wheezy-proposed-updates/main Sources/DiffIndex
命中 http://mirrors.aliyun.com wheezy-proposed-updates/non-free Sources/DiffIndex
命中 http://mirrors.aliyun.com wheezy-proposed-updates/contrib Sources/DiffIndex
命中 http://mirrors.aliyun.com wheezy-proposed-updates/main amd64 Packages/DiffIndex
命中 http://mirrors.aliyun.com wheezy-proposed-updates/non-free amd64 Packages/DiffIndex
命中 http://mirrors.aliyun.com wheezy-proposed-updates/contrib amd64 Packages/DiffIndex
命中 http://mirrors.aliyun.com wheezy-proposed-updates/contrib Translation-en/DiffIndex
命中 http://mirrors.aliyun.com wheezy-proposed-updates/main Translation-en/DiffIndex
命中 http://mirrors.aliyun.com wheezy-proposed-updates/non-free Translation-en/DiffIndex
正在读取软件包列表... 完成                
root@LookBack:~#