Comment 38 for bug 872824

It seems that solution described here:
http://ubuntuforums.org/showthread.php?t=1874132

perhaps i resolve it! the strongswan plugin is not compile with support for gtk3 so i recompile from source and it start!
you find a guide here (http://wiki.strongswan.org/projects/strongswan/wiki/NetworkManager). you must install some libraries (as explained in the guide, and install libnm-glib-vpn-dev library) and recopile and install only network manager plugin!