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/etc/xdg/cantor_r.knsrc is in cantor-backend-r 4:17.12.3-0ubuntu1.

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[KNewStuff3]
ProvidersUrl=http://download.kde.org/ocs/providers.xml
Categories=Cantor (Maxima),Cantor (Sage),Cantor (KAlgebra),Cantor (Qalculate),Cantor (Python 2),Cantor (Python 3),Cantor (Scilab),Cantor (Octave),Cantor (R),Cantor (Lua)
UploadCategories=Cantor (R)
TargetDir=cantor/examples
Uncompress=never
CustomName=true