/usr/share/doc/libdiet-sed2.8-dev/changelog.Debian.gz is in libdiet-sed2.8-dev 2.8.0-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdiet-sed2.8-dev/../libdiet-dagda2.8/changelog.Debian.gz