/usr/lib/ is in libkf5contacteditor-dev 4:17.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/KF5ContactEditor/
/usr/lib/x86_64-linux-gnu/cmake/KF5ContactEditor/KF5ContactEditorConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5ContactEditor/KF5ContactEditorConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5ContactEditor/KF5ContactEditorTargets-debian.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5ContactEditor/KF5ContactEditorTargets.cmake
/usr/lib/x86_64-linux-gnu/qt5/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_ContactEditor.pri
/usr/lib/x86_64-linux-gnu/qt5/plugins/
/usr/lib/x86_64-linux-gnu/qt5/plugins/akonadi/
/usr/lib/x86_64-linux-gnu/qt5/plugins/akonadi/contacts/
/usr/lib/x86_64-linux-gnu/qt5/plugins/akonadi/contacts/plugins/
/usr/lib/x86_64-linux-gnu/qt5/plugins/akonadi/contacts/plugins/categorieseditwidgetplugin.so
/usr/lib/x86_64-linux-gnu/libKF5ContactEditor.so