ubuntu update缺少公钥的解决方法
问题是这样地
W: GPG error: http://extras.ubuntu.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
下面是解决方法
$sudo gpg --keyserver keyserver.ubuntu.com --recv 3E5C1192
$sudo gpg --export --armor 3E5C1192 | sudo apt-key add -
$sudo apt-get update