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Local VM Ubuntu with Proton VPN gateway

IP forward​

sudo sysctl -w net.ipv4.ip_forward=1
sudo nano /etc/sysctl.conf
net.ipv4.ip_forward=1

Iptables​

sudo iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE
sudo apt install iptables-persistent
sudo service netfilter-persistent save
sudo ufw allow in on tun0 from any to any
sudo ufw allow out on tun0 from any to any

Ubuntu server​

By default all ports are closed. Open it

sudo iptables -P INPUT ACCEPT
sudo iptables -P OUTPUT ACCEPT
sudo iptables -P FORWARD ACCEPT
sudo iptables-save > /etc/iptables/rules.v4
sudo ufw disable
sudo ufw default allow incoming
sudo ufw default allow outgoing
sudo ufw enable

OpenVPN​

sudo apt install openvpn 
sudo apt install openresolv
sudo wget "https://raw.githubusercontent.com/ProtonVPN/scripts/master/update-resolv-conf.sh" -O "/etc/openvpn/update-resolv-conf"
sudo chmod +x "/etc/openvpn/update-resolv-conf"

OpenVPN config​

sudo mv /path/to/your/file.ovpn /etc/openvpn/client.conf
sudo systemctl enable openvpn-client@client.service
sudo systemctl start openvpn-client@client.service
sudo systemctl status openvpn-client@client.service

Then, modify the .ovpn file (/etc/openvpn/client.conf) to include this line:

sudo nano /etc/openvpn/credentials.txt
auth-user-pass /etc/openvpn/credentials.txt

Test​

 curl ip.me