/usr/share/doc/libpoppler-qt4-4/changelog.Debian.gz is in libpoppler-qt4-4 0.24.5-2ubuntu4.17.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libpoppler-qt4-4/../libpoppler44/changelog.Debian.gz