Thanks for the interest, but now I'm sure it has nothing to do with lightdm, 
but with the keyboard map that, apparently, has changed in the X environment 
from Spanish to English.
I have a Bluetooth Logitech MX 5000 keyboard with Spanish layout. As the login 
names only use alphanumeric characters, I couldn't perceive the problem, and, 
as the passwords have non-alphanumeric characters I couldn't authenticate 
correctly (but, again, as they are obscured, I didn't perceive the error). The 
weird thing is that in the text-based console the keyboard map was correct.
I have found a workaround for this problem in:
http://ubuntuforums.org/showthread.php?p=11334168
Now I can authenticate correctly, and the only remaining error is that the list 
of known users doesn't appear yet, so I have to type the login name and the 
password, instead of just clicking on the user name and typing the password.
I enclose my lightdm.log 

** Attachment added: "lightdm.log"
   
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/880799/+attachment/2573220/+files/lightdm.log

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https://bugs.launchpad.net/bugs/880799

Title:
  Cannot login in any graphical user interface

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