/usr/sbin/unity-greeter:6:_dbus_abort:_dbus_warn_check_failed:_dbus_warn_return_if_fail:dbus_connection_get_data:atspi_dbus_connection_setup_with_g_main

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding unity-greeter. This problem was most recently seen with package version 18.04.0+18.10.20180926-0ubuntu1, the problem page at https://errors.ubuntu.com/problem/1a42397fb849118d157316682163444d581ca97e contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.