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[b3nmore <1322275@xxxxxxxxxxxxxxxxxx>]

Another workaround, at least for those not requiring the a11y-indicator
(accessibility menu for visual impaired): removing the a11y-indicator
from the lightdm session,  seems to prevent the start of the sound-
indicator. Hence the sound-indicator does not block the termination of
lightdm session, hence the lightdm session vanishes after login.

The indicators started by lightdm are configured in the corresponding
'lightdm-*-greeter.conf' file (for xubuntu its '/etc/xdg/xdg-
xubuntu/lightdm/lightdm-gtk-greeter.conf') in the line 'show-
indicators='. Deleting the built-in "~a11y" solved the issue for me.

For a proper solution, one would have to investigate, why the sound-
indicator is blocking the clean termination of the lightdm session.
Maybe its some sort of reincarnation of
https://bugs.launchpad.net/ubuntu/+source/lightdm-gtk-
greeter/+bug/1290575.

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https://bugs.launchpad.net/bugs/1322275

Title:
  lightdm sessions started by dm-tool lock (or a session locker) never
  get closed

Status in Light Display Manager:
  New
Status in lightdm package in Ubuntu:
  Confirmed
Status in upstart package in Ubuntu:
  Confirmed

Bug description:
  dm-tool lock starts a new lightdm greeter (for unlocking) and a new
  logind session. After unlocking the greeter disappears, but the logind
  session never closes. loginctl session status c24 reports something
  like:

  c24 - lightdm (103)
             Since: Thu 2014-05-22 18:38:27 CEST; 30min ago
            Leader: 7872
              Seat: seat0; vc8
           Display: :1
           Service: lightdm-greeter; type x11; class greeter
             State: closing
            CGroup: systemd:/user/103.user/c24.session
                    └─7907 init --user --startup-event indicator-services-start

  This results in an accumulation of stale lightdm sessions after using
  e.g. a session locker for a while.

  I get this issue on a freshly installed and fully updated Xubuntu
  14.04.

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