/usr/share/doc/qtdeclarative5-ubuntu-ui-toolkit-plugin/changelog.Debian.gz is in qtdeclarative5-ubuntu-ui-toolkit-plugin 1.3.1918+16.04.20160404-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/qtdeclarative5-ubuntu-ui-toolkit-plugin/../libubuntugestures5/changelog.Debian.gz