Unit mcelogd.service could not be found.

Unit mcelogd.service could not be found的错误提示意味着mcelogd服务没有被找到。这个服务可能没有被正确安装或者已经被删除。要解决这个问题，你可以尝试以下步骤：
1. 检查mcelogd服务是否已经被正确安装。你可以使用命令systemctl status mcelogd.service来检查服务的状态。如果服务没有被安装，你需要使用适当的包管理器来安装它。
2. 如果服务已经被安装，但是仍然无法找到，你可以尝试重新安装服务。你可以使用命令sudo apt-get remove mcelogd.service来卸载服务，然后使用适当的包管理器重新安装它。
3. 如果以上两个步骤都没有解决问题，你可以尝试手动启动服务。你可以使用命令sudo systemctl start mcelogd.service来手动启动服务。如果服务能够正常启动，你可以使用命令sudo systemctl enable mcelogd.service来设置服务在系统启动时自动启动。

相关问题

Unit sshd..service could not be found. Unit service.service could not be found.

It seems like there is a typo in the command you are running. Instead of typing `sshd..service` or `service.service`, try typing `sshd.service` or the name of the specific service you are trying to use.

For example, to start the sshd service, you can use the following command:

sudo systemctl start sshd

To start a different service, replace `sshd` with the name of the service you want to start.

unit vsftpd.service could not be found

The error message "unit vsftpd.service could not be found" indicates that the system is unable to locate the vsftpd service unit file. This could be due to several reasons such as the service not being installed, the unit file being removed or renamed, or the system not having the necessary permissions to access the unit file.

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

1. Check if the vsftpd service is installed on your system by running the command `sudo apt-get install vsftpd`.

2. If the service is already installed, try restarting the systemd daemon by running the command `sudo systemctl daemon-reload`.

3. Check if the unit file exists in the systemd directory by running the command `ls /lib/systemd/system/vsftpd.service`.

4. If the unit file is missing, you can create a new one by creating a file called vsftpd.service in the /etc/systemd/system directory with the following contents:

[Unit]
Description=vsftpd FTP server
After=network.target

[Service]
ExecStart=/usr/sbin/vsftpd /etc/vsftpd.conf
ExecReload=/bin/kill -HUP $MAINPID
Restart=always

[Install]
WantedBy=multi-user.target

5. After creating the unit file, run the command `sudo systemctl daemon-reload` to reload the systemd daemon, and then start the vsftpd service by running the command `sudo systemctl start vsftpd.service`.

6. You can also enable the vsftpd service to start automatically at boot time by running the command `sudo systemctl enable vsftpd.service`.

I hope this helps!