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.
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https://bugs.launchpad.net/bugs/1070655
Title:
12.04 LTS Hangs on login
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