从 ubuntu 18.04 更新到 20.04 后，我无法启动 mysql 服务器，下面是运行journalctl -xe检查日志后的结果
-- The job identifier is 6019 and the job result is done.
Aug 15 19:35:13 System-Product-Name systemd[1]: mysql.service: Start request repeated too quickly.
Aug 15 19:35:13 System-Product-Name systemd[1]: mysql.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit mysql.service has entered the 'failed' state with result 'exit-code'.
Aug 15 19:35:13 System-Product-Name systemd[1]: Failed to start MySQL Community Server.
-- Subject: A start job for unit mysql.service has failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A start job for unit mysql.service has finished with a failure.
--
-- The job identifier is 6019 and the job result is failed.