Comment 1 for bug 1643276

This bug was fixed in the package lightdm - 1.21.1-0ubuntu2

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lightdm (1.21.1-0ubuntu2) zesty; urgency=medium

  Restore patch from 1.20.0-0ubuntu3:
  * Add debian/patches/terminate-session.patch: Terminate leftover processes
    in greeter session. It can happen that the greeter session does not
    properly clean up itself on logout. This causes leaked processes like
    settings-daemon which act on the user session as they share the same
    $DISPLAY. Ask logind to terminate remaining processes in the greeter
    session on closing, which is more robust than trying to fix every greeter.
    (LP: #1637758)

 -- Martin Pitt <email address hidden> Tue, 22 Nov 2016 09:43:39 +0100