The following lines were added (+) and removed (-):
== NetworkManager ==A program for providing detection and configuration for systems to automatically connect to networks. Network management framework (daemon and userspace tools) - A GUI thing. Network Manager has a command line tool that can be used to see which interfaces it is controlling. Pull up a terminal window and type the following command: nmcli dev statussample output: # nmcli dev status DEVICE TYPE STATE CONNECTION enp0s4 ethernet connected Wired connection 1 For Ubuntu and Mint distributions (recent like 18.3 or 19.2) this is how network interfaces are configured. Network Manager settings are controlled by the configuration file: /etc/NetworkManager/NetworkManager.confTo disable Network Manager for a specific interface, set parameter “managed=false" in NetworkManager.conf for that interface.Completely disable Network Manager so it does not control anything, even after reboot: sudo systemctl stop network-manager sudo systemctl mask network-manager