/usr/share/doc/libldns1-dbg/changelog.Debian.gz is in libldns1-dbg 1.6.17-1ubuntu0.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libldns1-dbg/../libldns1/changelog.Debian.gz
/usr/share/doc/libldns1-dbg/../libldns1/changelog.Debian.gz