/usr/share/kubuntu-default-settings/kf5-settings/muondatasourcesrc is in kubuntu-settings-desktop 1:16.04ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | [muon]
FeaturedSource=file:///usr/share/kubuntu-default-settings/kf5-profile/default/share/apps/muon-discover/featured.json
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