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:
... [main] dns=default ...
Delete the symlink /etc/resolv.conf
rm /etc/resolv.conf
create new /etc/resolv.conf
vim /etc/resolv.conf
Restart network-manager
sudo service network-manager restart
OR
sudo systemctl restart NetworkManager.service