/usr/share/kde4/config/superkaramba.knsrc is in plasma-scriptengine-superkaramba 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [KNewStuff2]
ProvidersUrl=http://download.kde.org/khotnewstuff/karamba-providers.xml
TargetDir=superkaramba/themes
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