Using the VPN of the Technical University Bergakademie Freiberg on Ubuntu 14.04 and previous version can be really easy. Please check if you are running NetworkManager like you should by default.

Now install the network-manager-vpnc extension by:

sudo apt-get update && sudo apt-get install -y network-manager-vpnc

Using system settings > Network Connections, or the nm-applet (the small network icon in your task bar) > Edit Connections
you should be able to follow this images:

Now set the empty fields to the values below, for user name, choose your default credential:

click on Advanced button:

Now the VPN should start by clicking inside the nm-applet:

Please also see the official pages (german):

http://tu-freiberg.de/urz-21
http://urz.tu-freiberg.de/urz/netze/vpn/index.html