não tem nada assim System > Administration > Window of beginning of session ?
Nesse caminho, não! Pena que não posso dar uma screen com essas janelas abertas para te mostar, pq a screen está em Application>Accessories>Take Screenshot.
olha só acho que o local para que apareça a opção de login e senha deve ser mesmo no arquivo gdm.conf que se encontra em /etc/gdm/. Pensei na parte que te falei, mas como está igual não é aí, mas este arquivo é enorme e pode ser em alguma outra parte.
Se você quiser posso colar aqui o meu arquivo gdm.conf, para se você quiser, após fazer um backup do seu, substituir pel meu para ver se a tela de login e senha aparece.
Pode mandar, pois estou tentando tudo para voltar ao normal.
Muitíssimo obrigado,
Marcopolo.
====Reedit===
E se fizermos o contrário, mudar de false (falso) para true(verdadeiro)?
Faz o seguinte cola aqui o conteúdo do seguinte arquivo:
gedit /etc/gdm/gdm.conf-custom
Está tudo ai:
# GDM Configuration Customization file.
#
# This file is the appropriate place for specifying your customizations to the
# GDM configuration. If you run gdmsetup, it will automatically edit this
# file for you and will cause the daemon and any running GDM GUI programs to
# automatically update with the new configuration. Not all configuration
# options are supported by gdmsetup, so to modify some values it may be
# necessary to modify this file directly by hand.
#
# Older versions of GDM used the "gdm.conf" file for configuration. If your
# system has an old gdm.conf file on the system, it will be used instead of
# this file - so changes made to this file will not take effect. Consider
# migrating your configuration to this file and removing the gdm.conf file.
#
# To hand-edit this file, simply add or modify the key=value combination in
# the appropriate section in the template below. Refer to the comments in the
# /usr/share/gdm/defaults.conf file for information about each option. Also
# refer to the reference documentation.
#
# If you hand edit a GDM configuration file, you should run the following
# command to get the GDM daemon to notice the change. Any running GDM GUI
# programs will also be notified to update with the new configuration.
#
# gdmflexiserver --command="UPDATE_CONFIG <configuration key>"
#
# e.g, the "Enable" key in the "[debug]" section would be "debug/Enable".
#
# You can also run gdm-restart or gdm-safe-restart to cause GDM to restart and
# re-read the new configuration settings. You can also restart GDM by sending
# a HUP or USR1 signal to the daemon. HUP behaves like gdm-restart and causes
# any user session started by GDM to exit immediately while USR1 behaves like
# gdm-safe-restart and will wait until all users log out before restarting GDM.
#
# For full reference documentation see the gnome help browser under
# GNOME|System category. You can also find the docs in HTML form on
#
http://www.gnome.org/projects/gdm/#
# NOTE: Lines that begin with "#" are considered comments.
#
# Have fun!
[daemon]
AutomaticLoginEnable=true
AutomaticLogin=evandro
[security]
[xdmcp]
[gui]
[greeter]
GraphicalTheme=circles
[chooser]
[debug]
[servers]
