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Not sure what I did but as of this morning ubuntu on my imac has been auto logging in as gdm. I've tried the following remedies

  1. reinstall lightdm and ubuntu-desktop
  2. delete auto-login and set auto-login-guest=false on /etc/gdm/custom.conf and /etc/lightdm/lightdm.conf
  3. set up a new user with identical permissions to my old one and try and re-login with that.
  4. upgrade to roaring-ringtail beta (I have nautilus 3.7.1 installed and I wondered if this might have had something to do with it)

Wierdly one of the effects is that when I open a terminal it opens and then disappears. I have to go to the tty terminal using Alt-Ctrl-f2 to make any changes. Not too sure what files I need to post to help resolve this, but would appreciate any help.

edit: the home directory for gdm is /var/lib/gdm (not sure if this helps)

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For gdm the following options in /etc/gdm/custom.conf are controlling the automatic login:



To disable the automatic login, ensure that TimedLoginEnable and AutomaticLoginEnable are switched to false.

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Thanks for replying @H.-DirkSchmitt. I've tried that and unfortunately it has no effect. The machine still boots up and auto logs in as gdm. Likewise changing it back to true and setting AutomaticLogin=myusername and TimedLogin=myusername has no effect – Tahnoon Pasha Mar 12 '13 at 10:26
@TahnoonPasha Do you really use gdm. Im a little bit confused by mentioning in your question lightdm`. – H.-Dirk Schmitt Mar 12 '13 at 10:28
Hi @H.-DirkSchmitt no I don't. I loaded gnome-3 when I was trying to install nautilus 3.7.5 but I have no real need for it. It just seems to be a permission class that is auto-loading itself as the user – Tahnoon Pasha Mar 12 '13 at 10:31

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