Как отключить systemd-resolved в Ubuntu

Отключаем сервис systemd-resolved:

sudo systemctl disable systemd-resolved
sudo systemctl stop systemd-resolved

Удаляем текущий /etc/resolv.conf это симлинк на /run/systemd/resolve/stub-resolv.conf

sudo rm /etc/resolv.conf

Создаем новый resolv.conf:

echo 'search mydomain.com' > /etc/resolv.conf
echo 'nameserver 8.8.8.8' >> /etc/resolv.conf
echo 'nameserver 1.1.1.1' >> /etc/resolv.conf
echo 'nameserver 1.0.0.1' >> /etc/resolv.conf