这段时间，公司部署的多个VPS/云服务器（debian 系统） 在进行 apt update 的时候提示下面错误，
Err:4 http://repo.mysql.com/apt/debian bookworm InRelease
The following signatures were invalid: EXPKEYSIG B7B3B788A8D3785C MySQL Release Engineering <mysql-build@oss.oracle.com>
部分VPS错误提示为：
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B7B3B788A8D3785C
解决方案：
1、编辑/etc/apt/sources.list.d/mysql.list 文件，去除 [signed-by=/usr/share/keyrings/mysql-apt-config.gpg] 字样
2、执行：
gpg --keyserver keyserver.ubuntu.com --recv-keys B7B3B788A8D3785C
3、更新gpg密钥到可信区
gpg --export --armor B7B3B788A8D3785C | tee /etc/apt/trusted.gpg.d/mysql.asc
完成上述操作后，可以顺利 apt update 和 upgrade.</mysql-build@oss.oracle.com>