I have signed up for a VPN (Virtual Private Network) service, and I configured it for use on my computer that runs Gnome Classic with the following instructions:

In Terminal, install openvpn packages with sudo apt-get install network-manager-openvpn.
1. Restart the network manager with sudo restart network-manager
2. Run sudo wget https://www.xxxxxxx.com/ovpnconfigure.zip
3. Extract the files from the zip with unzip ovpnconfigure.zip.
4. Move cert.crt to /etc/openvpn
5. Open the Network Manager on the menu bar.
6. Choose add and select the OpenVPN connection type, and click Create.
7. Enter Private Internet Access SSL for the Connection Name.
8. Enter xxxxxx.xxxxxxxx.com for the Gateway
9. Select Password and enter your login credentials.
10. Browse and select the CA Certificate we saved in Step 3.
11. Choose Advanced and enable LZO Compression.
12. Apply and exit.
13. Connect using the Network Manager.

It worked, but now I want to set up access to the same VPN service on another machine that runs Mythbuntu, which uses Xfce as its desktop manager. So every point from 5 on doesn't apply.

How can I modify the above instructions so that I can get my VPN service working with Xfce.

As a further note, while I can access the Xfce desktop directly if I need to, it's more convenient for me to access it via the command line and SSH from on of my other computers. A command line process would be ideal. (I looked for this, and found instructions only for PPTP access, whereas I need OpenVPN.)