/usr/lib/x86_64-linux-gnu/alsa-lib/libasound_module_rate_samplerate_best.so is in libasound2-plugins 1.0.27-2ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/alsa-lib/libasound_module_rate_samplerate.so