/usr/share/doc/libnetpbm10-dev/changelog.Debian.gz is in libnetpbm10-dev 2:10.0-15.3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libnetpbm10-dev/../libnetpbm10/changelog.Debian.gz
/usr/share/doc/libnetpbm10-dev/../libnetpbm10/changelog.Debian.gz