/usr/lib/x86_64-linux-gnu/libasynccpp.so is in libasynccpp-dev 15.11-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libasynccpp.so.1.4
/usr/lib/x86_64-linux-gnu/libasynccpp.so.1.4