Updater crashed while "waiting for configuration file prompt"

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http://askubuntu.com – Updater asked about a configuration file change. I clicked to see the differences, but that operation crashed. Now I am left half-way through an update, with a box saying waiting for configuration file prompt and no way to give it the reply it is waiting for. What do I do now? If I kill the Updater, will I end with a broken system (half updated)? Help please. (HowTos)