Public bug reported:

Its impossible to retype the login details if a mistake during login on
lightdm with userlist disabled. I noticed this problem on Xubuntu 12.04.

This bug can be reproduced always. I noticed it while trying to setup a
laptop image for my institute. We disabled the userlist for lightdm for
security purpose so that users would have to manually type in their
username. I noticed that if I made a mistake while typing the user
credentials (whether in the password or username) the lightdm gives me
the username/password incorrect error but it does not provide me the
username dialog box so that I can start all over again. What I get
instead is a message that asks me to retype the password (which should
not be the case because sometimes the mistake was in the username not
the password)

When this happens the best way to login is either to switch to console
mode and restart lightdm, or to reboot the computer completely. I think
this is a major bug which will affect many people who use Ubuntu (or in
my case xubuntu) in enterprise.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: lightdm 1.2.1-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.2.0-30.48-generic 3.2.27
Uname: Linux 3.2.0-30-generic i686
ApportVersion: 2.0.1-0ubuntu12
Architecture: i386
Date: Thu Sep 13 08:33:50 2012
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release i386 
(20120423)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.lightdm.users.conf: 2012-09-13T08:05:01.783164

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 precise

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https://bugs.launchpad.net/bugs/1050243

Title:
  unable to retype login details on lightdm with userlist disabled

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