/usr/lib/x86_64-linux-gnu/libxqilla.so.6 is in libxqilla6v5 2.3.3-2+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libxqilla.so.6.0.3
/usr/lib/x86_64-linux-gnu/libxqilla.so.6.0.3