/usr/share/doc/libfm-tools/changelog.Debian.gz is in libfm-tools 1.2.4-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libfm-tools/../libfm4/changelog.Debian.gz
/usr/share/doc/libfm-tools/../libfm4/changelog.Debian.gz