apt-get update问题

groundhog

现在用apt-get update总是有个源会有错：
W: GPG error: ftp://ftp.nerim.net sid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.
但这个源其它软件都是可以正常更新的。这个问题是什么原因？

terree

Post by groundhog
现在用apt-get update总是有个源会有错：
W: GPG error: ftp://ftp.nerim.net sid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.
但这个源其它软件都是可以正常更新的。这个问题是什么原因？

数据签名？
好复杂哦～～
我的个人理解：源用私钥加密传送的包，我们的机器用对应的公钥解密手收到的包。现在提示你没有这个源的公钥。
不知解释的恰当吗？请大家指正。