/usr/share/doc/libparpack2/changelog.Debian.gz is in libparpack2 3.5.0+real-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libparpack2/../libarpack2/changelog.Debian.gz
/usr/share/doc/libparpack2/../libarpack2/changelog.Debian.gz