Egoshin - the file won't be missing. My guess is that vpnc modifies that network_ipv4.script file (which is supposed to be there)..
because that file is modified.. when you updated today with the push from Nokia - dpkg refuses to replace files that were modified by the user (which it was, when you installed the application that modified it). It instead puts the file it WOULD have overwritten it with, as a .dpkg-dist file instead in order to extract the file to where it WOULD have gone, but not overwrite the modified file