/usr/share/kde4/config/kblocks.knsrc is in kblocks 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 4 | [KNewStuff3]
ProvidersUrl=http://newstuff.kde.org/cgi-bin/hotstuff-provider?site=kblocks
TargetDir=kblocks/themes
Uncompress=true
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