nit mysqld.service entered failed state.

As an AI language model, I don't have enough context to provide a specific solution to this issue. However, in general, "nit mysqld.service entered failed state" error message usually indicates that the MySQL service failed to start or has encountered an error during runtime. Some possible causes of this error are:

- Incorrect configuration of MySQL server or database.
- Insufficient permissions or incorrect ownership of the MySQL data directory.
- Corrupted or damaged MySQL database files.
- Resource limitations such as insufficient memory or disk space.

To resolve this issue, you can try the following steps:

1. Check the MySQL error log to identify the root cause of the error. The log file is usually located at `/var/log/mysql/error.log`.

2. Restart the MySQL service using the command: `sudo systemctl restart mysql`.

3. Check the status of the MySQL service using the command: `sudo systemctl status mysql`. If the service is still in a failed state, try to troubleshoot the error message and resolve any underlying issues.

4. If the issue persists, you may need to reinstall MySQL or restore a backup of your database.

Note: These are general steps to resolve the "nit mysqld.service entered failed state" error message. The actual solution may vary depending on the specific cause of the error.