/usr/lib/x86_64-linux-gnu/libsignon-glib.so.1 is in libsignon-glib1 1.13+16.04.20151209.1-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsignon-glib.so.1.0.0
/usr/lib/x86_64-linux-gnu/libsignon-glib.so.1.0.0