/usr/share/doc/libsmokeqtgui4-3/changelog.Debian.gz is in libsmokeqtgui4-3 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libsmokeqtgui4-3/../libsmokeqtcore4-3/changelog.Debian.gz