Unless stated in the its configuration file, the Network manager manages all the devices on a system.

Disabling the network manager:

To disable the network manager for the devices mentioned in the "/etc/network/interfaces", we would need to set the "managed" parameter to false:

Adding our interface to the "interfaces" file:

After setting the "managed" variable is set to "false", we go to the "/etc/network/interfaces" file and we add the setting for our interface "eno1":

We could also add a nameserver in the "/etc/resolv.conf" file:

Then we restart the networking using the below command so all the changes we made take effect:

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