/etc/xdg/knotes.categories is in knotes 4:17.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | org.kde.pim.knotes knotes (knotes)
org.kde.pim.noteshared knotes (noteshared)
org.kde.pim.knoteskontactplugin knotes (knotes kontact plugin)
org.kde.pim.notesagentagent knotes (note agent)
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