There is no public key available for the following key IDs

在对一台Debian服务器执行更新时，发生如下错误：

	infosource:/etc/apt# aptitude update

Hit ftp://ftp3.tsinghua.edu.cn stable Release.gpg

Hit ftp://ftp3.tsinghua.edu.cn stable/updates Release.gpg

Get:1 ftp://ftp3.tsinghua.edu.cn stable Release [63.2kB]

Hit ftp://ftp3.tsinghua.edu.cn stable/updates Release

Get:2 ftp://ftp3.tsinghua.edu.cn stable/main Packages/DiffIndex

Ign ftp://ftp3.tsinghua.edu.cn stable/main Packages/DiffIndex

Get:3 ftp://ftp3.tsinghua.edu.cn stable/contrib Packages/DiffIndex

Ign ftp://ftp3.tsinghua.edu.cn stable/contrib Packages/DiffIndex

Get:4 ftp://ftp3.tsinghua.edu.cn stable/main Sources/DiffIndex

Ign ftp://ftp3.tsinghua.edu.cn stable/main Sources/DiffIndex

Get:5 ftp://ftp3.tsinghua.edu.cn stable/contrib Sources/DiffIndex

Ign ftp://ftp3.tsinghua.edu.cn stable/contrib Sources/DiffIndex

Hit ftp://ftp3.tsinghua.edu.cn stable/main Packages

Get:6 ftp://ftp3.tsinghua.edu.cn stable/updates/main Packages/DiffIndex

Ign ftp://ftp3.tsinghua.edu.cn stable/updates/main Packages/DiffIndex

Hit ftp://ftp3.tsinghua.edu.cn stable/contrib Packages

Get:7 ftp://ftp3.tsinghua.edu.cn stable/main Sources

Err ftp://ftp3.tsinghua.edu.cn stable/main Sources

  Unable to fetch file, server said 'Can't open /mirror/debian/debian/dists/stable/main/source/Sources.gz: No such file or directory  '

Get:8 ftp://ftp3.tsinghua.edu.cn stable/contrib Sources

Err ftp://ftp3.tsinghua.edu.cn stable/contrib Sources

  Unable to fetch file, server said 'Can't open /mirror/debian/debian/dists/stable/contrib/source/Sources.gz: No such file or directory  '

Hit ftp://ftp3.tsinghua.edu.cn stable/updates/main Packages

Fetched 63.2kB in 0s (389kB/s)

Reading package lists... Done

W: There is no public key available for the following key IDs:

4D270D06F42584E6

W: You may want to run apt-get update to correct these problems

在因特网上google了一下，找到相关文档： http://www.linuxquestions.org/questions/debian-26/there-is-no-public-key...
其中介绍了二种方法，一种方法如下：

	Try this as root:

# gpg --recv-keys 4D270D06F42584E6

# gpg --export 4D270D06F42584E6 | apt-key add -

That should download the key from a public keyserver and then the second command adds it to apt. You may need to specify a keyserver if the default doesn't work. There are several public ones available.

另一种方法似乎更为简单：

	# apt-get install debian-keyring debian-archive-keyring

# apt-key update

尝试了第二种方法，成功解决了public key的问题。

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最后编辑时间为: May 19, 2016 at 03:05 pm