/etc/xdg/sddmtheme.knsrc is in kde-config-sddm 4:5.12.4-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | [KNewStuff3]
ProvidersUrl=https://autoconfig.kde.org/ocs/providers.xml
Categories=SDDM Theme
StandardResource=tmp
InstallationCommand=sddmthemeinstaller -i %f
UninstallCommand=sddmthemeinstaller -u %f
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