Ubuntu 14.04 has just recently started doing this to me too about a week ago, today being 2015-04-22. I keep Ubuntu upgraded on this 64bit PC (Intel i5) to the latest state nearly all the time.
I wonder if this helps: When I turn on the power (with the BIOS is set to start the PC when power resumes) I often see my desktop for an instant before the system flips to the login screen. If however I reboot the machine without downing the power, the auto logon works OK. Happy to do any diagnostics as directed. -- 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/1250875 Title: Lightdm sometimes fails to auto login Status in lightdm package in Ubuntu: Confirmed Bug description: Using ubuntu 14.04 and sometimes when I boot into ubuntu lightdm fails to auto login, and I must login manually in the unity greeter. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: lightdm 1.9.3-0ubuntu1 ProcVersionSignature: Ubuntu 3.12.0-2.7-generic 3.12.0 Uname: Linux 3.12.0-2-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.12.6-0ubuntu1 Architecture: amd64 Date: Wed Nov 13 14:33:18 2013 InstallationDate: Installed on 2013-10-10 (33 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Beta amd64 (20131008) MarkForUpload: True SourcePackage: lightdm UpgradeStatus: Upgraded to trusty on 2013-11-04 (9 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1250875/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
