/usr/share/doc/libprelude-dev/changelog.Debian.gz is in libprelude-dev 1.0.0-7build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libprelude-dev/../libprelude2/changelog.Debian.gz
/usr/share/doc/libprelude-dev/../libprelude2/changelog.Debian.gz