/usr/lib/x86_64-linux-gnu/libmarblewidget-qt5.so.23 is in libmarblewidget-qt5-23 4:15.12.3-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmarblewidget-qt5.so.0.22.20