Linux DNS leaking (mint OS 19.2)

Refer to: https://wiki.archlinux.org/index.php/OpenVPN#Update_systemd-resolved_script

On the "Override DNS servers using NetworkManager" section.

add (as root) "dns-priority=-1" under the [ipv4 section] to the file located at /etc/NetworkManager/system-connections/your_vpn_name, where your_vpn_name is the name of your VPN connection.

Restart Network manager services using these lines;

>sudo service network-manager stop

>sudo service network-manager start