/usr/lib/ is in libkf5akonadicalendar-dev 4:15.12.3-0ubuntu1.
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/KF5AkonadiCalendar/
/usr/lib/x86_64-linux-gnu/cmake/KF5AkonadiCalendar/KF5AkonadiCalendarTargets-debian.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5AkonadiCalendar/KF5AkonadiCalendarConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5AkonadiCalendar/KF5AkonadiCalendarConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5AkonadiCalendar/KF5AkonadiCalendarTargets.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_AkonadiCalendar.pri
/usr/lib/x86_64-linux-gnu/libKF5AkonadiCalendar.so