Public bug reported:

We're running Ubuntu 12.04.

The bug occurs with a number of PC running a kiosk-like setup with
password-free login. The desktop is standard Unity.

Scenario:

* User arrives at PC in library.
* User finds active session and wants to  log out to get a fresh session.
* User logs out
* User *immediately* presses button to login
* System hangs. 

The "system hanging" is like this: Desktop icons are present, but the
launcher is gone, and the top bar with the time and command menus
(including the logout menu) is also gone.

The only way out (bar hitting the power button) is to enter CTRL-ALT-
DEL, which opens a logout dialog. You can now choose to logout, wait a
while and login again.

It *seems* to be caused by the very swift sequence of logout + login.

It's annoying and thus a serious bug, since it's very confusing to
transient users, of which we have a lot.

** Affects: ubuntu-meta (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 12.04 freeze

** Package changed: xserver-xorg-video-intel (Ubuntu) => ubuntu-meta
(Ubuntu)

** Tags added: 12.04

** Tags added: freeze

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https://bugs.launchpad.net/bugs/1262637

Title:
  System hangs on login immediately after logout

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