/usr/share/metainfo/ is in plasma-workspace 4:5.8.6-2.1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/metainfo/org.kde.plasma.activitybar.appdata.xml
/usr/share/metainfo/org.kde.plasma.analogclock.appdata.xml
/usr/share/metainfo/org.kde.plasma.battery.appdata.xml
/usr/share/metainfo/org.kde.plasma.calendar.appdata.xml
/usr/share/metainfo/org.kde.plasma.clipboard.appdata.xml
/usr/share/metainfo/org.kde.plasma.devicenotifier.appdata.xml
/usr/share/metainfo/org.kde.plasma.digitalclock.appdata.xml
/usr/share/metainfo/org.kde.plasma.icon.appdata.xml
/usr/share/metainfo/org.kde.plasma.lock_logout.appdata.xml
/usr/share/metainfo/org.kde.plasma.mediacontroller.appdata.xml
/usr/share/metainfo/org.kde.plasma.notifications.appdata.xml
/usr/share/metainfo/org.kde.plasma.panelspacer.appdata.xml
/usr/share/metainfo/org.kde.plasma.private.systemtray.appdata.xml
/usr/share/metainfo/org.kde.plasma.systemmonitor.cpu.appdata.xml
/usr/share/metainfo/org.kde.plasma.systemmonitor.diskactivity.appdata.xml
/usr/share/metainfo/org.kde.plasma.systemmonitor.diskusage.appdata.xml
/usr/share/metainfo/org.kde.plasma.systemmonitor.memory.appdata.xml
/usr/share/metainfo/org.kde.plasma.systemmonitor.net.appdata.xml
/usr/share/metainfo/org.kde.plasma.systemtray.appdata.xml