/usr/share/doc/qtdeclarative5-ubuntu-ui-toolkit-plugin-gles/changelog.Debian.gz is in qtdeclarative5-ubuntu-ui-toolkit-plugin-gles 1.3.1918+16.04.20160404-0ubuntu3.
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It is a symlink to /usr/share/doc/qtdeclarative5-ubuntu-ui-toolkit-plugin-gles/../qml-module-ubuntu-components-gles/changelog.Debian.gz