Check OpenVPN, it's an open source virtual private network. Step by step guide provided by the Official Ubuntu Documentation on this link: OpenVPN. If this is too complicated there is an easier way to set a simple VPN.

The Top 30 Vpn Server Open Source Projects Set up Ubuntu Server 20.04 (or 18.04) as an IKEv2 VPN server Aws Vpn Server Setup ⭐ 654 Setup your own private, secure, free* VPN on the Amazon AWS Cloud in 10 minutes. How to Setup IPSec VPN server with L2TP and Cisco IPsec on Sep 19, 2018 OpenVPN - Community Help Wiki

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Ubuntu 18.04 LTS Set Up OpenVPN Server In 5 Minutes Apr 24, 2020

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Sep 21, 2016 5 best open source Linux server distributions - TechRepublic May 13, 2019 The Top 30 Vpn Server Open Source Projects