在Ubuntu或者Debian中，用apt-get更新时，，我可能经常出现 这种错误：
W: GPG error: http://kubuntu.org edgy Release: The following
signatures couldn't be verified because the public key
is not available: NO_PUBKEY A506E6D4DD4D5088
W: GPG error: http://wine.budgetdedicated.com edgy
Release: The following signatures couldn't be verified
because the public key is not available: NO_PUBKEY
58403026387EE263
W: You may want to run apt-get update to correct these problems
signatures couldn't be verified because the public key
is not available: NO_PUBKEY A506E6D4DD4D5088
W: GPG error: http://wine.budgetdedicated.com edgy
Release: The following signatures couldn't be verified
because the public key is not available: NO_PUBKEY
58403026387EE263
W: You may want to run apt-get update to correct these problems
这是由于GPG－KEY丢失，可以用下列命令来修复
gpg --keyserver hkp://subkeys.pgp.net --recv-keys 58403026387EE263
gpg --export --armor 58403026387EE263| sudo apt-key add -
gpg --export --armor 58403026387EE263| sudo apt-key add -
其中的58403026387EE263也可以只取其最后八位（387EE263）