The Network Manager controls this essential /etc/resolv.conf file to create permanent changes. So, we’ll first stop and disable the Network Manager: # chkconfig NetworkManager off # service NetworkManager stop OR # systemctl stop NetworkManager # systemctl disable NetworkManager

Ubuntu – Package Search Results -- network-manager You have searched for packages that names contain network-manager in all suites, all sections, and all architectures. Found 23 matching packages.. Exact hits Package network-manager. xenial (16.04LTS) (net): network management framework (daemon and userspace tools) 1.2.6-0ubuntu0.16.04.3 [security]: amd64 i386 1.1.93-0ubuntu4 [ports]: arm64 armhf powerpc ppc64el s390x The system network services are not compatible with this Jul 24, 2020

ifconfig Command. ifconfig is a command line interface tool for network interface configuration and …

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And Ubuntu provides NetworkManager and systemd-resolved. Ubuntu provides systemd-networkd which will be alternative of NetworkManager too. But systemd-networkd.service is disabled by default. So NetworkManager will be used for a while and you can use nmcli nmtui for a while. You need to know about systemd-resolved which is provided when Ubuntu NetworkRoaming - Ubuntu Wiki Feb 19, 2010