/usr/lib/x86_64-linux-gnu/libaubio.so.5 is in libaubio5 0.4.5-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libaubio.so.5.2.6
/usr/lib/x86_64-linux-gnu/libaubio.so.5.2.6