/etc/xdg/libkdepim.categories is in libkf5libkdepim-data 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 | org.kde.pim.libkdepim libkdepim (libkdepim)
org.kde.pim.libkdepimakonadi libkdepimakonadi (libkdepim)
org.kde.pim.ldapclient ldapclient (libkdepim)
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