I've been seeing this error since I came from Unity(Ubuntu 14.04) to Gnome. I solved this problem trying this steps:
$ sudo apt-get install lightdm-gtk-greeter $ sudo apt-get update && sudo apt-get upgrade $ sudo reboot Then my entire login interface changed(the options of interfaces moved to top right), but not to worry, they still there. And the bug is gone forever =] At least when I use Gnome, my computer is not made for Unity, too slow... *Sorry for my English, not native person ^^ * -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to at-spi2-core in Ubuntu. https://bugs.launchpad.net/bugs/1272859 Title: unity-greeter crashed with signal 5 in atspi_dbus_connection_setup_with_g_main() Status in Assistive Technology Service Provider Interface: New Status in “at-spi2-core” package in Ubuntu: Confirmed Status in “unity-greeter” package in Ubuntu: Confirmed Bug description: This happened when I logged into Ubuntu14.04 Alpha1 after upgrading from 13.10, it caused some of the display to blank for a time but seemed to recover after a few seconds. ProblemType: Crash DistroRelease: Ubuntu 14.04 Package: unity-greeter 14.04.1-0ubuntu2 ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0 Uname: Linux 3.13.0-5-generic x86_64 ApportVersion: 2.13.1-0ubuntu2 Architecture: amd64 CrashCounter: 1 Date: Sun Jan 26 08:18:36 2014 ExecutablePath: /usr/sbin/unity-greeter InstallationDate: Installed on 2013-09-27 (120 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) ProcCmdline: /usr/sbin/unity-greeter ProcEnviron: LANGUAGE=en_GB:en PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_GB.UTF-8 SHELL=/bin/false Signal: 5 SourcePackage: unity-greeter StacktraceTop: atspi_dbus_connection_setup_with_g_main () from /usr/lib/x86_64-linux-gnu/libatspi.so.0 ?? () from /usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0 ?? () from /usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 Title: unity-greeter crashed with signal 5 in atspi_dbus_connection_setup_with_g_main() UpgradeStatus: Upgraded to trusty on 2013-12-17 (39 days ago) UserGroups: To manage notifications about this bug go to: https://bugs.launchpad.net/at-spi/+bug/1272859/+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