Thanks Sebastien for the reply, I was begining to think I was all alone
here.
Well as you surmised, I was wrong.

The inability to login through the graphical desktop cropped up again,
running GDM, on battery power.

Guess I never paid attention to whether my laptop was running on battery
or not …  why should I have to?

Anyway it is obviously not a Lightdm bug, nor a GDM bug, but it seems to
me it is definitely a bug as all I changed was to do the distro-upgrade
from 10.04 LTS to 12.04 LTS.

Have no idea what the cause of the problem is now, what package is at
fault, but I'll tell how my system behaves in hope someone more
knowledgeable about what goes on behind the GUI will find a clue.

I reinstalled lightdm, since it was not the source of the problem,
making it the default display manager. I also reinstalled ubuntu-
desktop, which was automatically removed when I removed lightdm.
Interestingly it was identified as britty-ubuntu-desktop. I did not
reinstall lightdm-GTK-greeter.

When I rebooted and initially tried to login I was caught again in the
endless login loop (see previous post). This I was able to correct with:

        sudo chown -R user:user /home/user

Which I learned about here: http://b1ackb0x.blogspot.com/

Then I was able to login as follows:

On battery power … ubuntu 2D
On AC power …       ubuntu 3D, or 2D

If I try to login to ubuntu 3D on battery power nothing happens, well
the harddrive activity light flickers off and on, but the greeter
desktop remains and is frozen, the clock does not even advance.

I can drop to a command prompt (Ctrl-Alt-F1) and login that way and is
how I was able to reinstall lightdm. I cannot gedit, I guess for the
same reason the desktop freezes.

Oddly, at least to me, if I ctrl-alt-f7 I get to the graphical desktop
with desktop icons and unity sidebar, but a blank banner with no
controls at the top. And it is frozen.

Hope someone can figure this out and fix it.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1070655

Title:
  12.04 LTS Hangs on login

Status in “lightdm” package in Ubuntu:
  New

Bug description:
  Recently upgraded my laptop from Ubuntu 10.04 LTS to 12.04 LTS.
  Everything seemed to go well, system booted into 12.04, albeit very
  slowly. Was able to login no problem. Then shutdown. On next reboot
  ran into problem where system hangs at login. Get to splash screen
  with request for user password and have mouse control at that point,
  but when I enter my password the system stops responding. Ultimately I
  have to force a shutdown with the power button. The behavior is
  somewhat erratic in that sometimes the password request disappears
  along with the banner at top, other times it does not. Ocassionally I
  can succesfully login,  after severl tries over the course of a hafl
  hour or more. Seems to be just happenstance.

  Have noticed a few things. First time after I upgraded and loggen in
  there was a login sound. Now the sound is muted, every time. My GRUB
  default kernel is 3.2.0-31. If I use GRUB I can usually login using
  the next kernel down the list, 2.6.32-43. I also have kernal 3.2.0-32
  on the machine, but it does not show up in GRUB. I can't explain why
  not

  I can send along whatever log files you want, just need to know where
  to find them ... and succesfully login.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1070655/+subscriptions

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