啥是 debian-volatile?

以下是官方網站的說明:
What is debian-volatile?
Some packages aim at fast moving targets, such as spam filtering and virus scanning, and even when using updated data patterns, they do not really work for the full time of a stable release. The main goal of volatile is allowing system administrators to update their systems in a nice, consistent way, without getting the drawbacks of using unstable, even without getting the drawbacks for the selected packages. So debian-volatile will only contain changes to stable programs that are necessary to keep them functional.

http://www.debian.org/volatile/

由於我有使用 debian-volatile 裡的套件,結果,在做更新的時候發現有問題:
W: GPG error: http://volatile.debian.org etch/volatile Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EC61E0B0BBE55AB3
W: You may want to run apt-get update to correct these problems


後來自然就向 Google 大神請教:
# gpg --keyserver wwwkeys.eu.pgp.net --recv-key EC61E0B0BBE55AB3
# gpg --export EC61E0B0BBE55AB3 | apt-key add -


執行上述這兩行就 ok 了!

參考來源:
http://www.fatofthelan.com/forums/viewtopic.php?p=379&sid=048029c806c349d753fa257c97ed3129