/usr/lib/x86_64-linux-gnu/libdw.so is in libdw-dev 0.152-1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libdw.so.1
/usr/lib/x86_64-linux-gnu/libdw.so.1