7月 11 10:15:09 zhang-virtual-machine systemd[1]: Starting MySQL Community Server... zhang@zhang-virtual-machine:~$ journalctl -xeu mysql.service ░░ Defined-By: systemd ░░ Support: http://www.ubuntu.com/support ░░ ░░ An ExecStart= process belonging to unit mysql.service has exited. ░░ ░░ The process' exit code is 'exited' and its exit status is 1. 7月 11 10:16:07 zhang-virtual-machine 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'. 7月 11 10:16:07 zhang-virtual-machine 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 11397 and the job result is failed. 7月 11 10:16:07 zhang-virtual-machine systemd[1]: mysql.service: Scheduled restart job, restart counter is at 48. ░░ Subject: Automatic restarting of a unit has been scheduled ░░ Defined-By: systemd ░░ Support: http://www.ubuntu.com/support ░░ ░░ Automatic restarting of the unit mysql.service has been scheduled, as the result for ░░ the configured Restart= setting for the unit. 7月 11 10:16:07 zhang-virtual-machine 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 11470 and the job result is done. 7月 11 10:16:07 zhang-virtual-machine systemd[1]: Starting MySQL Community Server... ░░ Subject: A start job for unit mysql.service has begun execution ░░ Defined-By: systemd ░░ Support: http://www.ubuntu.com/support ░░ ░░ A start job for unit mysql.service has begun execution. ░░ ░░ The job identifier is 11470. lines 2126-2168/2168 (END)

根据日志显示，MySQL服务的启动失败并出现了错误代码1。这可能是由于配置文件中的错误、权限问题、数据库文件损坏或其他原因导致的。

以下是一些解决此问题的常见步骤：
1. 检查MySQL配置文件（通常位于/etc/mysql/mysql.conf.d目录下）是否存在任何语法错误或配置问题。可以尝试使用命令`sudo mysqld --verbose --help`来检查配置文件是否有问题。
2. 确保MySQL所需的目录和文件的权限设置正确。通常，MySQL的数据目录位于/var/lib/mysql，并且应该由mysql用户拥有。您可以使用`sudo chown -R mysql:mysql /var/lib/mysql`命令来更正权限问题。
3. 检查MySQL数据库文件是否被损坏。您可以尝试使用`mysqlcheck`命令来检查和修复数据库文件。例如，可以运行`sudo mysqlcheck --all-databases --fast`来检查所有数据库。
4. 查看系统日志以获取更详细的错误信息。可以使用`journalctl -xeu mysql.service`命令来查看MySQL服务的日志。
5. 如果以上步骤都没有解决问题，您可以尝试重新安装MySQL服务器。可以使用以下命令来卸载和重新安装MySQL：
- `sudo apt-get remove --purge mysql-server mysql-client mysql-common`
- `sudo apt-get autoremove`
- `sudo apt-get autoclean`
- `sudo apt-get install mysql-server`

请注意，重新安装MySQL可能会导致数据丢失，请确保提前备份重要的数据库文件。

希望这些步骤能够帮助您解决问题。