/usr/lib/libqwt-qt5.so is in libqwt-qt5-dev 6.1.2-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libqwt-qt5.so.6.1.2
/usr/lib/libqwt-qt5.so.6.1.2