This tutorial explain how to install Cisco VPN client on ubuntu 11.10.On Ubuntu, you don't need to install the Cisco VPN Client: NetworkManager includes support for Cisco IPSec VPNs.
Procedure to follow
Install network-manager-vpnc using the following command from your terminal
sudo apt-get install network-manager-vpnc
This will install vpnc, network-manager-vpnc and network-manager-vpnc-gnome.
Now you need to left click on your network manager applet (Located in your notification area) And choose "Configure VPN..."
Now you need to click on Add
Choose VPN connection type as "Cisco Compatible VPN(VPNC)" and click on create
Enater your cisco VPN details under VPN tab
Now you need to select IPV4 Settings tab click on routes
Here you need to select "Use this connection only for resources on its network" click ok otherwise your traffic significantly slowed down
To start your new VPN, just follow the steps again, but instead of "Configure VPN", you'll click on the entry you created.