想要在Ubuntu20.04中安装MySQL5.7:将错误启动请求重复到快速

Question

我需要在Ubuntu20.04上安装MySQL 5.7 :我完成了这个这里。在我做apt purge mysql-client mysql-server之前，它将8.0.X版本从我的系统中删除。

但是在安装apt install mysql-community-server=5.7.35-1ubuntu18.04时，我得到了错误：

    -- Automatic restarting of the unit mysql.service has been scheduled, as the 
       result for
    -- the configured Restart= setting for the unit.
    Okt 16 13:17:11 walter-CLS systemd[1]: Stopped MySQL Community Server.
    -- Subject: A stop job for unit mysql.service has finished
    -- Defined-By: systemd
    -- Support: http://www.ubuntu.com/support
    -- 
    -- A stop job for unit mysql.service has finished.
    -- 
    -- The job identifier is 12725 and the job result is done.
    Okt 16 13:17:11 walter-CLS systemd[1]: mysql.service: Start request repeated too    quickly.
    Okt 16 13:17:11 walter-CLS 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'.
    Okt 16 13:17:11 walter-CLS 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.

有人知道我能做些什么来解决这个问题吗？

编辑:我在20.04 Ubuntu上使用MySQL 5.7的原因是我的旧系统是一个仿生18.04，还有Typo3 {7.6.2]，它只适用于MySQL 5.7，而不是Ubuntu20.04上的MySQL 8.0.X。如果现在要在我的20.04计算机上运行MySQL 5.7，我想知道如何在我的新PC上升级我的Typo 7.6.20 MySQL-DBs，以便与适用于MySQL8.0.X的Typo3一起工作，这里列出了一个可兼容的列表：Typo3_vs_MySQL？

谢谢

Answer 1

原因是，我在/var/lib/mysql中有旧的MYSQL (用于8.0)。在我删除它们之后，我就可以做到了。