/usr/share/doc/libxfce4ui-glade/changelog.Debian.gz is in libxfce4ui-glade 4.13.4-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libxfce4ui-glade/../libxfce4ui-2-0/changelog.Debian.gz