Comment 4 for bug 238444

Let me try again.

Kubuntu is providing "sane" default settings for all of KDE (sane == what the Kubuntu teams considers sane) this also includes preventing khelpcenter from opening the index building at first start (also considering index building is pretty much broken and depends on loads of software we don't ship by default).

That said, either you install kubuntu-default-settings to supress the behaviour or your file a bug report in KDE's bug tracker. I certainly agree that the overal implementation of that dialog is somewhat awkward, but so is most of khelpcenter in it's current status.

Also: khelpcenter is part of the KDE package component kdebase-runtime, so the bug would belong here.