The following signatures couldn‘t be verified because the public key is not available: NO_PUBKEY A4
由于公钥不可用，无法验证以下签名:NO_PUBKEY A4B469963BF863CC
报错:
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A4B469963BF863CC
原因：
更换三方源没有对应的Key
解决：
没有什么key添加即可
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A4B469963BF863CC
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