Ubuntu W: GPG error: http://archive.ubuntukey....NO_PUBKEY 8D5A09

在用 sudo apt-get update 时出现这样的报错：

W: GPG error: http://archive.ubuntukylin.com:10006/ubuntukylin xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8D5A09DC9B929006

解决方案:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <PUBKEY>

 这里 <PUBKEY> 为8D5A09DC9B929006

然后再

sudo apt-get update