Public bug reported:

New installation of Ubunto 14.04 delivered on a Dell Precision Tower
5810.  After first major upgrade including updates to kernel and NVIDIA
graphics drivers, this issue appeared.

\\loin screen appears - then when password is entered and either mouse-
click or CR, the screen goes black and after a short time (1-2s) the log
on screen re-appears.

None of the suggested repair routes have worked.  (Routes include trying gdm, 
updating lightdm and gdm.)
NVIDIA graphics card is Quadro K1200. 

Description  14.04.5 LTS, release 14.04

Package is xorg.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lightdm 1.10.6-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-38.57~14.04.1-generic 4.4.19
Uname: Linux 4.4.0-38-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
Date: Sun Oct  2 20:25:25 2016
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-trusty-amd64-osp1-20150720-0
InstallationDate: Installed on 2016-09-25 (6 days ago)
InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 
20150720-04:06
LightdmConfig:
 [SeatDefaults]
 autologin-guest=false
 autologin-user-timeout=0
 autologin-session=lightdm-autologin
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages trusty

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1629701

Title:
  log-in screen loops indefinitely

Status in lightdm package in Ubuntu:
  New

Bug description:
  New installation of Ubunto 14.04 delivered on a Dell Precision Tower
  5810.  After first major upgrade including updates to kernel and
  NVIDIA graphics drivers, this issue appeared.

  \\loin screen appears - then when password is entered and either
  mouse-click or CR, the screen goes black and after a short time (1-2s)
  the log on screen re-appears.

  None of the suggested repair routes have worked.  (Routes include trying gdm, 
updating lightdm and gdm.)
  NVIDIA graphics card is Quadro K1200. 

  Description  14.04.5 LTS, release 14.04

  Package is xorg.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: lightdm 1.10.6-0ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-38.57~14.04.1-generic 4.4.19
  Uname: Linux 4.4.0-38-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  Date: Sun Oct  2 20:25:25 2016
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-trusty-amd64-osp1-20150720-0
  InstallationDate: Installed on 2016-09-25 (6 days ago)
  InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 
20150720-04:06
  LightdmConfig:
   [SeatDefaults]
   autologin-guest=false
   autologin-user-timeout=0
   autologin-session=lightdm-autologin
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1629701/+subscriptions

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