Public bug reported:

Kubuntu LiveDVD downloaded from an approved mirror and burned to DVD.
sha256sum matches for ISO and check media reports no issues.

After executing "Try Kubuntu" and finally getting to the desktop,
Konsole opens, but upon pressing any key in the console window, X (or
KDE?) seems to crash, showing me the text bootup screen for a few
seconds and then some sort of Plasma screen requiring me to enter a
password.

The only way to get a working command line is to use one of X's text
console screens.

Very bizarre and I can't believe that I am either the only one to
experience this or the first one to report it.

Here is the contents of /var/log/apport.log:
ERROR: apport (pid 5011) Sun Oct 28 21:06:46 2012: called for pid 4682, signal 
6, core limit 4294967295
ERROR: apport (pid 5011) Sun Oct 28 21:06:46 2012: executable: /usr/bin/Xorg 
(command line "/usr/bin/X :0 -core -auth /var/run/lightdm/root/:0 -nolisten tcp 
vt7 -novtswitch")
ERROR: apport (pid 5011) Sun Oct 28 21:06:46 2012: is_closing_session(): no 
DBUS_SESSION_BUS_ADDRESS in environment
ERROR: apport (pid 5011) Sun Oct 28 21:06:51 2012: wrote report 
/var/crash/_usr_bin_Xorg.0.crash
ERROR: apport (pid 5011) Sun Oct 28 21:06:51 2012: writing core dump to 
/etc/X11/core (limit: 4398046510080)
ERROR: apport (pid 5011) Sun Oct 28 21:06:54 2012: writing core dump 
/etc/X11/core of size 52105216

Here's a possibly relevant lines from /var/log/syslog:
Oct 28 21:06:12 kubuntu org.kde.powerdevil.backlighthelper: QDBusConnection: 
system D-Bus connection created before QCoreApplication. Application may 
misbehave.
Oct 28 21:06:12 kubuntu dbus[1325]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'

Nothing out of the ordinary in /var/log/Xorg.0.log.

I can reproduce this at will so please advise what else may be needed.

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: kubuntu

** Tags added: kubuntu

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https://bugs.launchpad.net/bugs/1072483

Title:
  [kubuntu] 12.10 liveDVD any key in konsole forces plasma password
  screen

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