ubuntu 出现signature canot be verified 错误

 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3C962022012520A0 
 sudo apt-get update

其中3C96……换成出错的key

When you add a third-party repository, you should also add its key to your system. The public key is a string which identifies that certain repository. You can find some more information on this and how to add the key here.