This bug was fixed in the package gnome-session - 3.30.1-1ubuntu1

---------------
gnome-session (3.30.1-1ubuntu1) disco; urgency=medium

  [ Iain Lane ]
  * Merge with Debian, remaining changes:
    - debian/control.in:
      + Recommend session-migration
      + Move xwayland dependency to gnome-session and make gnome-session
        Arch: any
      + Split gnome-startup-applications to a separate binary package so
        that it can be uninstalled without breaking the system
      + Add unity-session
    - Split ubuntu-session out of gnome-session.
    - Add upstart user session and systemd user session:
      debian/data, debian/gnome-session-bin.user-session.upstart
    - debian/gnome-session-bin.postinst, debian/gnome-session-bin.prerm:
       Moved registering gnome-session binary as a session manager to
       gnome-session-bin package
    - Add gnome-session-wayland transitional package
    - don't install gnome-mimeapps.list (installed by desktop-file-utils in
      Ubuntu):
      debian/gnome-session-common.dirs, gnome-session-common.install,
      gnome-session-common.maintscript, gnome-session-common.postinst
    - debian/patches/103_kill_the_fail_whale.patch:
      + Kill the Fail Whale as it tends to be more annoying than helpful
    - debian/patches/22_support_autostart_delay.patch:
      + Bugzilla patch to support adding a delay to autostart apps, using
        a "X-GNOME-Autostart-Delay" key in the desktop file
    - debian/patches/50_ubuntu_sessions.patch:
      + Add ubuntu session tweaks
    - debian/patches/51_remove_session_saving_from_gui.patch:
      + Add GNOME_SESSION_SAVE environment variable for people wanting to
        use the save session still, knowing that it can break your system
        if used unwisely
    - debian/patches/53_add_sessionmigration.patch:
      + launch session-migration if present at the start of the session.
        This sync tool runns different session migration scripts that can be
        provided in various desktop packages.
    - debian/patches/95_dbus_request_shutdown.patch:
      + Add "RequestShutdown" and "RequestReboot" DBus methods to allow
        other applications to shutdown or reboot the machine via the session
        manager.
    - debian/patches/ignore_gsettings_region.patch:
      + Ignore the "region" gsettings value - users' setting of LC_*
        variables saved in ~/.pam_environment.
    - debian/patches/revert_remove_gnome_session_properties.patch:
      + Don't merge translations into gnome-session-properties.desktop
  * debian/patches/50_ubuntu_sessions.patch:
    - moved to debian/patches/ubuntu/ubuntu-sessions.patch (using gbp topic)
  * ubuntu/ignore_gsettings_region.patch: Refresh

  [ Marco Trevisan (Treviño) ]
  * debian/ubuntu-settings-migrate-to-defaults.18.10.0.py:
    - renamed to ubuntu-settings-migrate-to-defaults.18.10.1.py
      + Also run in ubuntu-wayland desktop session (LP: #1799205)

gnome-session (3.30.1-1) unstable; urgency=medium

  * Team upload
  * New upstream release
  * Bump Standards-Version to 4.2.1
  * d/rules: Remove gnome-get-source.mk (please use uscan instead)
  * Set Rules-Requires-Root to no

gnome-session (3.30.0-2) unstable; urgency=medium

  * Team upload
  * Release to unstable
    - d/gbp.conf, d/control: Set branch back to debian/master
    - d/watch: Only watch for upstream stable (even-numbered) releases

gnome-session (3.30.0-1) experimental; urgency=medium

  * Team upload

  [ Iain Lane ]
  * debian/gbp.conf: Don't use patch numbers
  * d/p/debian/Revert-main-Remove-GNOME_DESKTOP_SESSION_ID-envvar.patch: Mark
    as not-needed upstream

  [ Raphaël Hertzog ]
  * Update gnome-mimeapps.list for evince's renamed desktop file
    (Closes: #908177)

  [ Simon McVittie ]
  * d/gbp.conf: Add standard post-import hook
  * New upstream release
  * d/copyright: Update

 -- Iain Lane <email address hidden>  Fri, 30 Nov 2018 16:32:53 +0000