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/etc/xdg/messagelib.categories is in kf5-messagelib-data 4:17.12.3-0ubuntu3.

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# messagelib
org.kde.pim.messagecomposer messagelib (messagecomposer)
org.kde.pim.messagecore messagelib (messagecore)
org.kde.pim.messagelist messagelib (messagelist)
org.kde.pim.messageviewer messagelib (messageviewer)
org.kde.pim.templateparser messagelib (templateparser)
org.kde.pim.mimetreeparser messagelib (mimetreeparser)
org.kde.pim.webengineviewer messagelib (webengineviewer)