Failed to restart ipvsadm.service: Unit not found.

This error message means that the "ipvsadm" service is not installed on your system or is not running. Ipvsadm is a tool used to administer the Linux Virtual Server (LVS) kernel module.

To fix this issue, you can try installing the ipvsadm package using the package manager for your Linux distribution. For example, on Ubuntu, you can use the following command:

sudo apt-get install ipvsadm

Once the package is installed, you can try restarting the ipvsadm service using the following command:

sudo systemctl restart ipvsadm

If the service still cannot be found, you may need to check if it is installed correctly or contact your system administrator for further help.