W: GPG error: http://dl.google.com/linux/chrome/deb stable Release: The following signatures couldn'

Ubuntu 16.04.2执行 sudo apt-get update 。警告如下：W: GPG error: http://dl.google.com/linux/chrome/deb stable Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 6494C6D6997C215E

报错原因是：google chrome 改变了linux的key仓库。

解决办法：执行下面语句即可。

wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -

解决后的效果图：

参考链接：https://askubuntu.com/questions/943146/apt-update-error-an-error-occurred-during-the-signature-verification-chrome