这是我运行 apt-get update 时得到的结果：
/root$ sudo apt-get update
Get:1 http://security.debian.org jessie/updates InRelease [1,507 B]
Get:2 http://cdn.debian.net jessie InRelease [1,507 B]
Get:3 http://cdn.debian.net jessie-updates InRelease [1,507 B]
Err http://security.debian.org jessie/updates InReleaset/lists/partial/security.debian.org_dists_jessie_updates_InRelease into data and signature failed
Err http://cdn.debian.net jessie InReleasep /var/lib/apt/lists/partial/cdn.debian.net_debian_dists_jessie_InRelease into data and signature failed
Err http://cdn.debian.net jessie-updates InReleaseib/apt/lists/partial/cdn.debian.net_debian_dists_jessie-updates_InRelease into data and signature failed
Fetched 4,521 B in 1s (4,271 B/s)
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.debian.org jessie/updates InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://cdn.debian.net jessie InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://cdn.debian.net jessie-updates InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)
W: Failed to fetch http://cdn.debian.net/debian/dists/jessie/InRelease
W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease
W: Failed to fetch http://cdn.debian.net/debian/dists/jessie-updates/InRelease
W: Some index files failed to download. They have been ignored, or old ones used instead.
我正在阅读这篇文章，但我仍然对 GPG 密钥如何与存储库一起使用感到有点困惑。
每个存储库都有一个与其关联的密钥，在允许从该存储库进行更新之前，我需要在我的计算机上信任该密钥，对吗？那么，如果此错误是由于密钥过期引起的，如何导入新密钥？
编辑：我也很好奇为什么它说“Clearsigned 文件无效”。我认为 Clearsign 仅用于包装文本文档而不是 tar 球 - 除非我读过这错误的。
答案1
我不确定是否应该删除这个问题，因为事实证明这是非常常见的代理问题。
我确信这不是它，但做了一个 wget -O-http://cdn.debian.net/debian/dists/jessie/InRelease按照建议从我们的代理返回了响应。我不认为我指的是我们的代理，但我是！