Comment 3 for bug 151867

The gutsy version of network-manager-kde/knetworkmanager isn't compiled with pptp support. I've recompiled the package with pptp support, which creates the pptp configuration interface, but there is a mismatch of names: The NetworkManager configuration calls it the "ppp" service, but knetworkmanager calls it the "pptp" service.

I did get it to work. Download the source package for network-manager-kde, edit debian/rules to add "--with-pptp" to the DEB_CONFIGURE_EXTRA_FLAGS variable, rebuild and reinstall the package, then edit /etc/NetworkManager/VPN/nm-ppp-starter.name to change the "name=ppp" line to "name=pptp". Restart the NetworkManager service (and knetworkmanager itself), and you'll be up and running. This had no effect on the Gnome applet, but allowed the KDE applet to connect without problems.

I suppose you could also edit the network-manager-pptp package, but I suspect that it would be cleaner to update the network-manager-kde package to look for the correct vpn service name.