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172.17.70.21 是内网的一个apt源，每天定时从搜狐更新。从另一台内外机器通过apt-get update时，提示如下日志，之前update还好用呢，今天不知道为什么忽然就不好用了……


neunn@ubuntu:/var/lib/apt/lists/partial$ sudo apt-get update
[sudo] password for neunn:
Ign http://172.17.70.21 trusty InRelease
Ign http://172.17.70.21 trusty-security InRelease
Ign http://172.17.70.21 trusty-updates InRelease
Ign http://172.17.70.21 trusty-proposed InRelease
Get:1 http://172.17.70.21 trusty Release.gpg [933 B]
Get:2 http://172.17.70.21 trusty-security Release.gpg [933 B]
Get:3 http://172.17.70.21 trusty-updates Release.gpg [933 B]
Get:4 http://172.17.70.21 trusty-proposed Release.gpg [933 B]
Get:5 http://172.17.70.21 trusty-backports InRelease [15.2 kB]
Hit http://172.17.70.21 trusty Release
Get:6 http://172.17.70.21 trusty-security Release [59.7 kB]
Get:7 http://172.17.70.21 trusty-updates Release [59.7 kB]
Ign http://172.17.70.21 trusty-backports InRelease Splitting up /var/lib/apt/lists/partial/172.17.70.21_ubuntu_dists_trusty-backports_InRelease into data and signature failed
E: GPG error: http://172.17.70.21 trusty-backports InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)

複製下面這一行 貼到終端機 執行 # 完整一行 避免打錯字
sudo mv /var/lib/apt/lists/partial/172.17.70.21_ubuntu_dists_trusty-backports_InRelease /var/lib/apt/lists/partial/172.17.70.21_ubuntu_dists_trusty-backports_InRelease.backup
然後 重新執行更新看看

poloshiao 写了：複製下面這一行 貼到終端機 執行 # 完整一行 避免打錯字
sudo mv /var/lib/apt/lists/partial/172.17.70.21_ubuntu_dists_trusty-backports_InRelease /var/lib/apt/lists/partial/172.17.70.21_ubuntu_dists_trusty-backports_InRelease.backup
然後 重新執行更新看看

按照您的方法，还是提示原来的错误。
尝试这把/etc/apt/source.list中的trusty-backports 注释掉，可以update，这个有影响么？
deb http://172.17.70.21/ubuntu/ trusty main restricted universe multiverse
deb http://172.17.70.21/ubuntu/ trusty-security main restricted universe multiverse
deb http://172.17.70.21/ubuntu/ trusty-updates main restricted universe multiverse
deb http://172.17.70.21/ubuntu/ trusty-proposed main restricted universe multiverse
#deb http://172.17.70.21/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://172.17.70.21/ubuntu/ trusty main restricted universe multiverse
deb-src http://172.17.70.21/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://172.17.70.21/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://172.17.70.21/ubuntu/ trusty-proposed main restricted universe multiverse
#deb-src http://172.17.70.21/ubuntu/ trusty-backports main restricted universe multiverse

尝试这把/etc/apt/source.list中的trusty-backports 注释掉，可以update，这个有影响么？

表示 trusty-backports 套件庫 就不列入 你的電腦中的軟件來源名單

按照您的方法，还是提示原来的错误。

表示錯誤來源是 下載伺服器 的 trusty-backports 目錄裡的檔案
如果你有使用 proxy 也有可能 錯誤來源是 proxy 的 trusty-backports 目錄裡的檔案

源是不可信任的，这里有解决方法：http://www.linuxidc.com/Linux/2010-03/25187.htm