/usr/lib/x86_64-linux-gnu/libcpuset.so is in libcpuset-dev 1.0-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcpuset.so.1.1.0
/usr/lib/x86_64-linux-gnu/libcpuset.so.1.1.0