Ubuntu Server Tutorial Needed

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Hi folks,

I want to set up AirVPN on my Raspberry Pi. I installed Ubuntu Server, but I have not ever found any adequate tutorial or guide on how to set OpenVPN with stunnel and AirVPN, then share the connection.  That kind of tutorial requires some details, which are hard to understand for a general user, like applying specific iptables rules, blocking all traffic except VPN in all respects. Can the community help me on this matter? Any help will be appreciated. Thanks.