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Setting up a VPN (Virtual Private Network) server in Ubuntu involves more complex configuration and security considerations compared to a simple proxy server. Here, I'll provide you with a general overview of setting up an OpenVPN server, which is a popular VPN solution.

Please note that setting up a VPN server requires careful attention to security, network configuration, and client management. Here's a high-level guide to get you started with setting up an OpenVPN server on Ubuntu:

1. Install OpenVPN: Open a terminal and install OpenVPN using the package manager:

   sudo apt update
   sudo apt install openvpn

2. Generate Certificates and Keys: OpenVPN requires certificates and keys for encryption and authentication. You can use the easy-rsa tool included with OpenVPN to generate these:

   sudo apt install easy-rsa

   Then, copy the easy-rsa scripts to a directory you can work in:

   mkdir ~/openvpn-ca
   cp -r /usr/share/easy-rsa/* ~/openvpn-ca/

   Edit the vars file inside the ~/openvpn-ca directory to customize your certificate settings:

   nano ~/openvpn-ca/vars

   After editing, run the following commands to initialize the certificate authority:

   cd ~/openvpn-ca
   source vars
   ./clean-all
   ./build-ca

   Follow the prompts to create your CA (Certificate Authority) certificate.

3. Generate Server Certificate and Key: Create the server certificate and key:

   ./build-key-server server

   Follow the prompts and set a passphrase for the server key.

4. Generate Diffie-Hellman Parameters: Generate Diffie-Hellman parameters for key exchange:

   ./build-dh

5. Create HMAC Signature: Generate an HMAC signature for additional security:

   openvpn --genkey --secret keys/ta.key

6. Copy Files: Copy the necessary files to the OpenVPN configuration directory:

   sudo cp keys/{server.crt,server.key,ca.crt,dh2048.pem,ta.key} /etc/openvpn

7. Copy Sample Configuration: Copy the sample server configuration file:

   zcat /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz | sudo tee /etc/openvpn/server.conf

8. Edit Configuration: Edit the OpenVPN configuration file:

   sudo nano /etc/openvpn/server.conf

   Customize the configuration based on your requirements. Pay attention to settings like subnet, DNS servers, and routes.

9. Start OpenVPN: Start and enable the OpenVPN service:

   sudo systemctl start openvpn@server
   sudo systemctl enable openvpn@server

10. Client Configuration: Create client certificates and configuration files using similar steps as the server, then distribute them to your clients.

11. Firewall Rules: Configure your firewall to allow OpenVPN traffic. For example, if you're using UFW:

sudo ufw allow OpenSSH
sudo ufw allow 1194/udp
sudo ufw enable

12. Test the VPN: Test the VPN connection from a client device. You can use the OpenVPN client software to connect.

Remember, this is a simplified overview. Configuring a VPN server requires careful attention to security, firewall rules, network settings, and client management. It's recommended to consult the official OpenVPN documentation and other resources for a comprehensive setup tailored to your specific needs.