/usr/share/doc/libboost-all-dev/changelog.gz is in libboost-all-dev 1.54.0.1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libboost-all-dev/../libboost-dev/changelog.gz
/usr/share/doc/libboost-all-dev/../libboost-dev/changelog.gz