This bug was fixed in the package gnome-shell - 3.24.2-0ubuntu3
--------------- gnome-shell (3.24.2-0ubuntu3) artful; urgency=medium
* Extend ubuntu-lightdm-user-switching.patch to allow locking screen using LightDM (LP: #1684205)
-- Jeremy Bicha <email address hidden> Sun, 14 May 2017 21:42:39 -0400
This bug was fixed in the package gnome-shell - 3.24.2-0ubuntu3
---------------
gnome-shell (3.24.2-0ubuntu3) artful; urgency=medium
* Extend ubuntu- lightdm- user-switching. patch to allow
locking screen using LightDM (LP: #1684205)
-- Jeremy Bicha <email address hidden> Sun, 14 May 2017 21:42:39 -0400