启动时报错Failed to start mysqld.service: Unit not found.

这个错误提示表明mysqld服务没有被找到或者没有被正确安装。你可以尝试重新安装mysql服务，或者检查一下服务的名称是否正确。你可以使用如下命令来查看当前系统中所有的服务列表：

systemctl list-units --type=service

如果没有mysqld服务的话，你需要先安装mysql服务。你可以使用如下命令来安装mysql服务：

sudo apt-get install mysql-server

安装完成后，你可以使用如下命令来启动mysql服务：

sudo systemctl start mysql

如果你已经安装了mysql服务但是依然出现了这个错误提示，那么你可以尝试重新安装一下mysql服务并重启服务器。

相关问题

systemctl start mysqld.service Failed to start mysqld.service: Unit mysqld.service not found.

当你使用命令"systemctl start mysqld.service"启动MySQL时，报错"Failed to start mysqld.service: Unit not found."，这通常意味着系统找不到mysqld.service这个单位。这可能是由于以下几个原因引起的：

1. MySQL未正确安装：首先，请确保你已经正确安装了MySQL，并且安装过程中没有出现任何错误。你可以使用"yum install mysql-server"命令来安装MySQL。如果你已经安装了MySQL，请确保你的安装过程没有出现错误。

2. 服务名称错误：检查一下你使用的服务名称是否正确。在某些情况下，MySQL服务的名称可能不是mysqld.service，而是mysql.service。你可以通过使用"systemctl list-units | grep mysql"命令来查看所有与MySQL相关的服务名称。

3. 没有启用MySQL服务：在某些情况下，即使你正确安装了MySQL，它也可能没有被启用。你可以使用"systemctl enable mysql"命令来启用MySQL服务。

总之，在解决这个问题之前，请确保你已经正确地安装了MySQL，并且你正在使用正确的服务名称来启动MySQL服务。如果问题仍然存在，请提供更多的详细信息，以便我们能够更好地帮助你解决这个问题。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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Failed to start mysqld.service: Unit mysqld.service not found.

As an AI language model, I cannot access your system and provide a solution for this error. However, this error usually occurs when the MySQL service is not installed or has been removed from the system. You can try reinstalling MySQL and then starting the service again.

Here are the steps to install and start MySQL on a Linux system:

1. Update your system:

2. Install MySQL: 

3. Start the MySQL service:

4. Check the status of the MySQL service: 

If MySQL is still not starting, you can check the MySQL error log for more information on the issue. The error log can be found in the /var/log/mysql directory.

If you are still facing issues, it is recommended to seek help from a professional or consult the MySQL documentation for further troubleshooting steps.