/usr/share/doc/libecal-1.2-16/changelog.Debian.gz is in libecal-1.2-16 3.10.4-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libecal-1.2-16/../libcamel-1.2-45/changelog.Debian.gz