This bug was fixed in the package gnome-session - 3.28.1-0ubuntu3
--------------- gnome-session (3.28.1-0ubuntu3) bionic; urgency=medium
* Prevent debian/unity-gnome-shell-migration.17.10.py script migration crash when no Ubuntu Dock or Dash to Dock installed after upgrade (LP: #1720310)
-- Didier Roche <email address hidden> Wed, 02 May 2018 09:40:42 +0200
This bug was fixed in the package gnome-session - 3.28.1-0ubuntu3
---------------
gnome-session (3.28.1-0ubuntu3) bionic; urgency=medium
* Prevent debian/ unity-gnome- shell-migration .17.10. py script migration
crash when no Ubuntu Dock or Dash to Dock installed after upgrade
(LP: #1720310)
-- Didier Roche <email address hidden> Wed, 02 May 2018 09:40:42 +0200