This is a combination of two problems. One is that starting update-
manager results in these warnings:

/usr/bin/update-manager:28: PyGIWarning: Gtk was imported without specifying a 
version first. Use gi.require_version('Gtk', '3.0') before import to ensure 
that the right version gets loaded.
  from gi.repository import Gtk
/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py:26: PyGIWarning: 
GdkX11 was imported without specifying a version first. Use 
gi.require_version('GdkX11', '3.0') before import to ensure that the right 
version gets loaded.
  from gi.repository import Gdk, GdkX11
/usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py:29: PyGIWarning: 
Dbusmenu was imported without specifying a version first. Use 
gi.require_version('Dbusmenu', '0.4') before import to ensure that the right 
version gets loaded.
  from gi.repository import Dbusmenu, Unity
/usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py:29: PyGIWarning: 
Unity was imported without specifying a version first. Use 
gi.require_version('Unity', '7.0') before import to ensure that the right 
version gets loaded.
  from gi.repository import Dbusmenu, Unity

The other is that when openafs-client is installed, the presence of
/usr/bin/sys causes Python to crash while displaying these warnings (see
linked bugs).

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https://bugs.launchpad.net/bugs/1512209

Title:
  update-manager crashed with SyntaxError in find_cookie(): invalid or
  missing encoding declaration for '/usr/bin/sys'

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