SoftEther VPN Server install for Ubuntu/Debian/Centos includes adblocking dnsmasq and support for custom opened ports
https://whattheserver.com/softether-vpnserver-with-port-forwarding/
https://whattheserver.com/softether-vpn-install-script_for-ubuntu/
Latest install script is: softether-vpnserver-multiOS-install-v.02.sh