This bug was fixed in the package gnome-shell - 3.16.4-0ubuntu1
--------------- gnome-shell (3.16.4-0ubuntu1) wily; urgency=medium
* New upstream release - fixes issues with gdm Auth prompt LP: #1479014
-- Tim Lunn <email address hidden> Sun, 18 Oct 2015 08:43:05 +1100
This bug was fixed in the package gnome-shell - 3.16.4-0ubuntu1
---------------
gnome-shell (3.16.4-0ubuntu1) wily; urgency=medium
* New upstream release
- fixes issues with gdm Auth prompt LP: #1479014
-- Tim Lunn <email address hidden> Sun, 18 Oct 2015 08:43:05 +1100