Thanks for the gdm logs. It seems gdm has some difficulties with
ConsoleKit, but I'm afraid I need more details, at least the ck-list-
sessions and ps aux output.

If other people want to provide information, here are instructions how
to collect everything interesting:

 *  Open a Terminal and do

      echo 'rm -r /var/log/gdm/* /var/log/Xorg*' | sudo -s

 * reboot
 * log in as one user
 * attempt to switch user

You should now be on a black screen, as reported. Press Control-Alt+F1,
log into the text console, and do

  ps aux > /tmp/ps.txt
  who > /tmp/who.txt
  ck-list-sessions > /tmp/ck.txt 2>&1
  sudo tar czvf ~/logs.tar.gz /var/log/gdm /var/log/Xorg* /var/log/kern.log 
/tmp/ps.txt /tmp/who.txt /tmp/ck.txt

The press Control-Alt-F7 or Control-Alt-F8 to get back to your original
session (if neither works, just restart the computer with Control-Alt-
Delete), and attach logs.tar.gz here.

Thanks!

** Changed in: gdm (Ubuntu)
       Status: New => Incomplete

-- 
user switch crashes with process termination (lucid alpha)
https://bugs.launchpad.net/bugs/529882
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