mtask

Source:  https://askubuntu.com/questions/907246/how-to-disable-systemd-resolved-in-ubuntu

Disable the systemd-resolved service and stop it:

sudo systemctl disable systemd-resolved.service
sudo service systemd-resolved stop
Put the following line in the [main] section of your /etc/NetworkManager/NetworkManager.conf:

dns=default
Delete the symlink /etc/resolv.conf