So I still see this bug on several machines here that runs Ubuntu 20.04
with Gnome Flashback. And I suspects this bug causes Updatemanager to
fail sometimes when the system autostarts it while the screensaver is
activated. (The program is running minimized, but unable to unminimize.
You have to close/kill it and manually start it)

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https://bugs.launchpad.net/bugs/1736011

Title:
  CRITICAL: Unable to create a DBus proxy for GnomeScreensaver: Error
  calling StartServiceByName for org.gnome.ScreenSaver:
  GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process
  org.gnome.ScreenSaver exited with status 1

Status in gnome-session package in Ubuntu:
  Confirmed

Bug description:
  That error is logged:

  org.gnome.ScreenSaver[1081]: Unable to init server: Could not connect:
  Connection refused

  then:

  gnome-session[895]: gnome-session-binary[895]: CRITICAL: Unable to
  create a DBus proxy for GnomeScreensaver: Error calling
  StartServiceByName for org.gnome.ScreenSaver:
  GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process
  org.gnome.ScreenSaver exited with status 1

  oem@ubuntu:~$ localectl
     System Locale: LANG=en_US.UTF-8
         VC Keymap: n/a
        X11 Layout: fr
         X11 Model: pc105
       X11 Variant: oss

  So, with googling help (https://bbs.archlinux.org/viewtopic.php?id=180103), 
i've edited /etc/locale-gen (as user) and uncommented the line: fr_FR.UTF-8
   and then ran 'sudo locale-gen' and finally rebooted.

  But the error is still logged after reboot: either i need to set also
  'VC Keymap', but how ?, or it is related to the vte version actually
  used (and need an upgrade)
  (https://bugs.launchpad.net/ubuntu/+source/vte2.91/+bug/1721412)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-session 3.26.1-0ubuntu7
  ProcVersionSignature: Ubuntu 4.13.0-18.21-generic 4.13.13
  Uname: Linux 4.13.0-18-generic x86_64
  ApportVersion: 2.20.8-0ubuntu2
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Sun Dec  3 17:17:45 2017
  EcryptfsInUse: Yes
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-session
  UpgradeStatus: No upgrade log present (probably fresh install)

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