After installation of Docker, the message "mysql.service failed due to control process exit with error code" is appearing.

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This error message indicates that the MySQL service failed to start properly due to an issue with its control process. It could be caused by a variety of factors such as incorrect configuration, missing permissions, or conflicts with other services.

To troubleshoot the issue, try the following steps:

1. Check the MySQL logs: Use the command sudo journalctl -xe to check the MySQL logs for any errors or warnings that might indicate the cause of the issue.

2. Check the MySQL service status: Use the command sudo systemctl status mysql.service to check the status of the MySQL service. If it is not running, try starting it using the command sudo systemctl start mysql.service.

3. Check MySQL configuration: Check the MySQL configuration file (/etc/mysql/my.cnf) for any errors or conflicts. Ensure that the configuration is correct, and there are no syntax errors.

4. Restart Docker: Restart Docker using the command sudo systemctl restart docker.service and then try starting the MySQL service again.

If none of the above steps resolve the issue, consider seeking further assistance or consulting the Docker and MySQL documentation for more information.