Failed to start nfs.service: Unit not found

It seems that you are encountering an issue with the "nfs" service. This error message suggests that the "nfs" service is not installed or not found on your system.

You can try to install or reinstall the "nfs" service using your system's package manager. For example, if you are using a Debian-based system, you can run the following command to install the "nfs" service:

sudo apt-get install nfs-kernel-server

Alternatively, if you are using a Red Hat-based system, you can run the following command to install the "nfs" service:

sudo yum install nfs-utils

Once the "nfs" service is installed, you can try starting it again using the following command:

sudo systemctl start nfs.service

I hope this helps to resolve your issue. Let me know if you have any further questions.