How do I fix the GPG error “NO_PUBKEY”?

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本文提供了在Ubuntu系统中解决GPG错误的方法，即因缺少公钥导致的软件包签名验证失败问题。通过使用终端执行特定命令，导入缺失的公钥并更新APT源，确保系统的软件包管理正常运行。

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Execute the following commands in terminal

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

where <PUBKEY> is your missing public key for repository, e.g. 8BAF9A6F.

Then update

sudo apt-get update

ALTERNATE METHOD:

sudo gpg --keyserver pgpkeys.mit.edu --recv-key  <PUBKEY>
sudo gpg -a --export <PUBKEY> | sudo apt-key add -
sudo apt-get update

Note that when you import a key like this using apt-key you are telling the system that you trust the key you're importing to sign software your system will be using. Do not do this unless you're sure the key is really the key of the package distributor.

https://askubuntu.com/questions/13065/how-do-i-fix-the-gpg-error-no-pubkey