The lightdm-greeter-session doesn't seem to help in this case, at-spi uses its own private DBus server which is launched by at-spi-bus-launcher which in turn seems to be run by the at-spi GTK module.
The lightdm- greeter- session doesn't seem to help in this case, at-spi uses its own private DBus server which is launched by at-spi-bus-launcher which in turn seems to be run by the at-spi GTK module.