树莓派 GPG error[通俗易懂]

给树莓派换了阿里云的镜像源后， 更新软件源，出现了GPG error问题。

W: GPG error: http://mirrors.ustc.edu.cn/debian buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 04EE7237B7D453EC NO_PUBKEY 648ACFD622F3D138 NO_PUBKEY DCC9EFBF77E11517 E: The repository 'http://mirrors.ustc.edu.cn/debian buster InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

解决办法

此代码由Java架构师必看网-架构君整理
gpg --keyserver  keyserver.ubuntu.com --recv-keys <PUBKEY>
gpg --export --armor  <PUBKEY> | sudo apt-key add -

# gpg --keyserver keyserver.ubuntu.com --recv-keys 04EE7237B7D453EC
# gpg --export --armor 04EE7237B7D453EC | sudo apt-key add -