/usr/share/doc/librelion+mpi-dev/changelog.Debian.gz is in librelion+mpi-dev 1.4+dfsg-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/librelion+mpi-dev/../librelion+mpi-1.4-1/changelog.Debian.gz