/usr/share/libdiscover/ is in plasma-discover-private 5.6.2-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/libdiscover/applicationsbackend/
/usr/share/libdiscover/applicationsbackend/releasechecker
/usr/share/libdiscover/backends/
/usr/share/libdiscover/backends/knscomics-backend.desktop
/usr/share/libdiscover/backends/knsplasmoids-backend.desktop
/usr/share/libdiscover/backends/qapt-backend.desktop
/usr/share/libdiscover/categories/
/usr/share/libdiscover/categories/knscomics-backend-categories.xml
/usr/share/libdiscover/categories/knsplasmoids-backend-categories.xml
/usr/share/libdiscover/categories/qapt-backend-categories.xml
/usr/share/libdiscover/popcontestratings.txt
/usr/share/libdiscover/rnrtestratings.txt