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[Jonathan Sahagun <1322275@xxxxxxxxxxxxxxxxxx>]

Hello, here's what I did on my Xubuntu installation that seems to work:

In this file:
/etc/xdg/xdg-xubuntu/lightdm/

In line 27, in a default installation, it reads:
show-indicators=power;~session;~language;~a11y;~power;

Remove the first "power" entry, leaving only the built-in indicators:
show-indicators=~session;~language;~a11y;~power;

Save the file, and any subsequent lock screens and the processes they
spawn should now exit properly upon screen unlock.

I can't say for sure why it solves the issue on my Xubuntu, but I
suspect that trying to include two power indicators might cause one or
the other to prevent lightdm's indicator services instance  from
properly terminating.

Can you see if this solves the issue on your computers?

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
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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