Could you please attach /var/log/lightdm/lightdm.log after this occurs?
This will show if it is lightdm causing the problem or the session is
just not completing logout.
** Changed in: lightdm (Ubuntu)
Status: Confirmed => Incomplete
** Changed in: lightdm (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1262637
Title:
System hangs on login immediately after logout
Status in “lightdm” package in Ubuntu:
Incomplete
Bug description:
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1262637/+subscriptions
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