/usr/ is in plasma-discover-snap-backend 5.12.4-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/libexec/
/usr/lib/x86_64-linux-gnu/libexec/discover/
/usr/lib/x86_64-linux-gnu/libexec/discover/SnapMacaroonDialog
/usr/lib/x86_64-linux-gnu/libexec/kauth/
/usr/lib/x86_64-linux-gnu/libexec/kauth/libsnap_helper
/usr/lib/x86_64-linux-gnu/qt5/
/usr/lib/x86_64-linux-gnu/qt5/plugins/
/usr/lib/x86_64-linux-gnu/qt5/plugins/discover/
/usr/lib/x86_64-linux-gnu/qt5/plugins/discover/snap-backend.so
/usr/share/
/usr/share/dbus-1/
/usr/share/dbus-1/system-services/
/usr/share/dbus-1/system-services/org.kde.discover.libsnapclient.service
/usr/share/doc/
/usr/share/doc/plasma-discover-snap-backend/
/usr/share/doc/plasma-discover-snap-backend/copyright
/usr/share/libdiscover/
/usr/share/libdiscover/categories/
/usr/share/libdiscover/categories/snap-backend-categories.xml
/usr/share/metainfo/
/usr/share/metainfo/org.kde.discover.snap.appdata.xml
/usr/share/polkit-1/
/usr/share/polkit-1/actions/
/usr/share/polkit-1/actions/org.kde.discover.libsnapclient.policy
/usr/share/doc/plasma-discover-snap-backend/changelog.Debian.gz