Comment 26 for bug 93413

I've solved it by rebuilding without the patch:

cd /usr/src
sudo apt-get source vpnc
cd vpnc-0.4.0/debian/patches

sudo gedit 00list

remove the line 06_stolen_from_head

cd ../..
sudo debian/rules binary

cd ..

sudo apt-get remove vpnc
sudo dpkg -i vpnc_0.4.0-2ubuntu1_i386.deb

if you had installed network-manager-vpnc you'll have to reinstall it

be careful when upgrading the system, don't update vpnc or you will get the patched version