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I just updated 14.04 to latest patches using the GUI: software update. After that, a restart was required, and now cannot log into any of my accounts. I am sure the passwrds are all correct, it just bounces me back to the same login screen (as opposed to when I really type a bad passwd, then ubuntu states that "Incorrect Passwd"). The only other thing I did was change my background image.

Information from my auth.log:

Apr 29 16:00:56 jj-home lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm gnome-keyring-daemon[2449]: couldn't set environment variable in session: The name of the org.gnone.SessionManager was not provided by any .service files gnome-keyring-daemon[2449]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting. lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
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up vote 2 down vote

This is a known bug with lightdm. There are ways to possibly fix it, along with ways of working around the problem. Make sure your computer is connected to the internet and enter a TTY by pressing Ctrl + ALT + F2. Log in here, then try the following:

  1. Purge and reinstall lightdm:
    Run sudo apt-get remove --purge lightdm. Once that's done, run sudo apt-get update and then sudo apt-get install lightdm && sudo dpkg --configure lightdm.
  2. Reconfigure lightdm:
    I've never had much much luck with this, but you might.
    Run sudo dpkg-reconfigure lightdm.
  3. Install another Display Manager, such as gdm:
    Run sudo apt-get install gdm.
    When you are asked which Display Manager to use by default, choose gdm.

Reboot after all of these.

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When I try to install lightdm, I get the following error: dpkg: error processing package alien (--configure): package alien is not ready for configuration, cannot configure (current state is 'half installed') – Martin Kenley Apr 30 '15 at 0:33
    
@MartinKenley Alien? OK. Try running sudo apt-get remove --purge alien and then sudo apt-get install alien before the other commands. – TheWanderer Apr 30 '15 at 0:47
    
Anyway I continued with the other steps since it said that lightdm was installed. Now when I rebooted, and choose Ubuntu from Grub menu, I get a black screen. I am using a new Nvidia GTX 960 video card. – Martin Kenley Apr 30 '15 at 0:48
    
What commands (all of them exactly) did you run? – TheWanderer Apr 30 '15 at 0:53
    
sudo apt-get remove --purge lightdm. sudo apt-get update a sudo apt-get install lightdm && sudo dpkg --configure lightdm. sudo dpkg-reconfigure lightdm. sudo apt-get install gdm. – Martin Kenley Apr 30 '15 at 0:55
up vote -1 down vote

I had the same problem after the latest update. I fixed it by disabling the secure boot in the bios .. a few other people have had the same problem.

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