/usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile-fast.so is in liblttng-ust-dev 2.5.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile-fast.so.0.0.0