How to setup an OpenVPN server on Ubuntu 18.04,20.04,22.04 LTS

Step 1

Welcome to the OpenVPN installer!
The git repository is available at: https://github.com/angristan/openvpn-install

I need to ask you a few questions before starting the setup.
You can leave the default options and just press enter if you are ok with them.

I need to know the IPv4 address of the network interface you want OpenVPN listening to.
Unless your server is behind NAT, it should be your public IPv4 address.
IP address: [YOUR-SERVER-IP-ADDRESS]

If the IP printed by the script is correct and corresponds to the one taken with the previous step, press enter.

Step 2

Checking for IPv6 connectivity...

Your host does not appear to have IPv6 connectivity.

Do you want to enable IPv6 support (NAT)? n

If your Server has an ipv6 the script should recognize it automatically otherwise you will have n and you just have to press enter.

Step 3

What port do you want OpenVPN to listen to?
   1) Default: 1194
   2) Custom
   3) Random [49152-65535]
Port choice [1-3]: 1

If you have other services listening on OpenVPN’s default port choose 2 and enter the port you want to use, but by default just hit enter.

Step 4

What protocol do you want OpenVPN to use?
UDP is faster. Unless it is not available, you shouldn't use TCP.
   1) UDP
   2) TCP
Protocol [1-2]: 1

Hit enter to select UDP protocol (Best performance), or write 2 instead of 1 if you want use TCP protocol (Best stability).

Step 5

What DNS resolvers do you want to use with the VPN?
   1) Current system resolvers (from /etc/resolv.conf)
   2) Self-hosted DNS Resolver (Unbound)
   3) Cloudflare (Anycast: worldwide)
   4) Quad9 (Anycast: worldwide)
   5) Quad9 uncensored (Anycast: worldwide)
   6) FDN (France)
   7) DNS.WATCH (Germany)
   8) OpenDNS (Anycast: worldwide)
   9) Google (Anycast: worldwide)
   10) Yandex Basic (Russia)
   11) AdGuard DNS (Anycast: worldwide)
   12) NextDNS (Anycast: worldwide)
   13) Custom
DNS [1-12]: 11

Choose the DNS server you prefer 11 to block ads, otherwise choose the cloudflare DNS servers by typing 3, when you’ve done hit enter.

Step 6

Do you want to use compression? It is not recommended since the VORACLE attack makes use of it.
Enable compression? [y/n]: n

Here for safety, leave compression disabled by pressing only enter.

Step 7

Do you want to customize encryption settings?
Unless you know what you're doing, you should stick with the default parameters provided by the script.
Note that whatever you choose, all the choices presented in the script are safe. (Unlike OpenVPN's defaults)
See https://github.com/angristan/openvpn-install#security-and-encryption to learn more.

Customize encryption settings? [y/n]: n

You can proceed leaving the default parameters of the script by pressing enter here as well.

Step 8

Tell me a name for the client.
The name must consist of alphanumeric character. It may also include an underscore or a dash.
Client name: [VPN-CLIENT-NAME]

Write what you prefer and hit enter in this step as well.

Step 9

Do you want to protect the configuration file with a password?
(e.g. encrypt the private key with a password)
   1) Add a passwordless client
   2) Use a password for the client
Select an option [1-2]: 1

This is the last step. Proceed by pressing enter if you want to create a client without a password, otherwise if you want to be asked for a password during the connection, type 2 and press enter.
Remember that to access your VPN server you still need to have the file that OpenVPN generates at the end of the script.

The End

Download the .ovpn file and import it in your OpenVPN client.

Now download the file that you find inside the folder where you downloaded the script and insert it in any OpenVPN client.

How to create more clients

Re-run the installation script to add a new client that will be able to connect to your OpenVPN server

Welcome to OpenVPN-install!
The git repository is available at: https://github.com/angristan/openvpn-install

It looks like OpenVPN is already installed.

What do you want to do?
   1) Add a new user
   2) Revoke existing user
   3) Remove OpenVPN
   4) Exit
Select an option [1-4]: 1

Type 1 and press enter and follow the procedure of steps 8 and 9.