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From [1], it was said that

1) All users and providers of PPTP VPN solutions should immediately start migrating to a different VPN protocol. PPTP traffic should be considered unencrypted.

So, besides OpenVPN (since user need to install additional program), what would be the recommended choice if we use Ubuntu?


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I would suggest L2TP. Most operating systems (Windows, Mac, Linux) and devices such as phones/tablets have a built-in L2TP VPN client.

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