MySQL 存储库密钥突然再次过期，因此在 Ubuntu 中运行时出现 GPG 错误 apt-get update
apt-get update
错误是 W: GPG error: http://repo.mysql.com/apt/ubuntu xenial InRelease: The following signatures were invalid: KEYEXPIRED 1550412832 KEYEXPIRED 1550412832 KEYEXPIRED 1550412832
W: GPG error: http://repo.mysql.com/apt/ubuntu xenial InRelease: The following signatures were invalid: KEYEXPIRED 1550412832 KEYEXPIRED 1550412832 KEYEXPIRED 1550412832
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