/usr/lib/x86_64-linux-gnu/libquantum.so.8 is in libquantum8 1.1.1-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libquantum.so.8.0.0
/usr/lib/x86_64-linux-gnu/libquantum.so.8.0.0