1.
apt update
apt install openvpn

2.
cp client.ovpn /etc/openvpn/

3.1. openvpn --config /etc/openvpn/client.ovpn

3.2 Запуск OpenVPN как службы
ln -s /etc/openvpn/client.ovpn /etc/openvpn/default.conf
systemctl restart openvpn
systemctl enable openvpn