This bug was fixed in the package gnome-desktop3 - 3.28.2-0ubuntu1.1
--------------- gnome-desktop3 (3.28.2-0ubuntu1.1) bionic-security; urgency=medium
* Enable bubblewrap hardening for thumnbailers (LP: #1795668)
-- Jeremy Bicha <email address hidden> Tue, 02 Oct 2018 10:26:01 -0400
This bug was fixed in the package gnome-desktop3 - 3.28.2-0ubuntu1.1
---------------
gnome-desktop3 (3.28.2-0ubuntu1.1) bionic-security; urgency=medium
* Enable bubblewrap hardening for thumnbailers (LP: #1795668)
-- Jeremy Bicha <email address hidden> Tue, 02 Oct 2018 10:26:01 -0400