/usr/share/doc/gir1.2-signon-1.0/changelog.Debian.gz is in gir1.2-signon-1.0 1.10daily13.06.25-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gir1.2-signon-1.0/../libsignon-glib1/changelog.Debian.gz