VPN-only Internet Access on Linux Mint 19.3 via Private Internet Access

Setting up Private Internet Access VPN is usually not a problem these days as Linux version is readily available among the supported clients. However, such installation requires GUI. What if we don't want or need one?

For setup to work independently of GUI, one approach is to use OpenVPN client usually installed by default. Also needed are PIA's IP-based OpenVPN configuration files. While this might cause issues down the road if that IP changes, it does help a lot with security as we won't need to poke an unencrypted hole (and thus leak information) for DNS.

From the PIA configuration archive extract your choice of .ovpn file (usually going with the one physically closest to you will give you the best results). There is no need to extract .crt and .pem files as configuration has certificates embedded.

Rest of the VPN configuration needs to be done from the Bash:

sudo cp ~/Downloads/openvpn-ip/US\ Seattle.ovpn /etc/openvpn/client/pia.conf

echo "auth-user-pass /etc/openvpn/client/pia.login" | sudo tee -a /etc/openvpn/client/pia.conf
echo "mssfix 1400" | sudo tee -a /etc/openvpn/client/pia.conf
echo "dhcp-option DNS" | sudo tee -a /etc/openvpn/client/pia.conf
echo "dhcp-option DNS" | sudo tee -a /etc/openvpn/client/pia.conf
echo "script-security 2" | sudo tee -a /etc/openvpn/client/pia.conf
echo "up /etc/openvpn/update-resolv-conf" | sudo tee -a /etc/openvpn/client/pia.conf
echo "down /etc/openvpn/update-resolv-conf" | sudo tee -a /etc/openvpn/client/pia.conf

The basic VPN setup is already completed but we still need to setup our login (replacing username and password with the actual values):

echo 'username' | sudo tee -a /etc/openvpn/client/pia.login
echo 'password' | sudo tee -a /etc/openvpn/client/pia.login
sudo chmod 400 /etc/openvpn/client/pia.login

Firewall rules are to allow data flow only via VPN's tun0 interface with only encrypted VPN traffic being allowed on port 1198.

sudo sed -i 's/IPV6=yes/IPV6=no/' /etc/default/ufw
yes | sudo ufw reset
sudo ufw default deny incoming
sudo ufw default deny outgoing
sudo ufw allow out on tun0
sudo ufw allow out on eth0 proto udp to `cat /etc/openvpn/client/pia.conf \
| grep "^remote " | grep -o ' [^ ]* '` port 1198
sudo ufw disable
sudo ufw enable

To test VPN connection execute:

sudo openvpn --config /etc/openvpn/client/pia.conf

Assuming test was successful (i.e. resulted in Initialization Sequence Completed message), we can further make sure data is actually traversing VPN. I've found whatismyipaddress.com quite helpful here. Just check if IP detected is different then IP you usually get without VPN.

Stop the test connection using Ctrl+C and proceed to configure OpenVPN's auto-startup. Reboot is there just to test if auto-startup works.

sudo systemctl enable openvpn-client@pia
sudo reboot

This should give you quite secure setup without the need for GUI.

[2020-07-06: Works with Linux Mint 20 too.]
[2020-08-07: Added step to disable IPv6.]

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