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I recently switched my 13.10 installation from Unity to Gnome Shell. I did that by installing ubuntu-gnome-desktop. Everything is working fine and I'm using LightDM, but I want to switch to GDM to get the full Gnome Experience.

I ran dpkg-reconfigure gdm, choose GDM and rebooted. Ubuntu seemed to boot as usual, but at the end of the boot process all I could see is a black screen. I switched to the terminal and ran service gdm stop and them service lightdm start to make sure LightDM still works, and it does.

Then I stopped LightDM and ran sudo gdm --fatal-warnings. This time I could see the cursor and move it, but gdm did not start. I'll I could find the the syslog was:

Nov 7 22:42:41 tarsonis gnome-session[3055]: dconf-CRITICAL: unable to op en file '/etc/dconf/db/gdm': Failed to open file '/etc/dconf/db/gdm': open () failed: No such file or directory; expect degraded performance

Nov 7 22:42:41 tarsonis gdm-simple-slave[2977]: Failed to give slave prog rams access to the display. Trying to proceed.

Nov 7 22:42:16 tarsonis gdm-simple-slave[2209]: GLib-GObject: g_object_un ref: assertion 'object->ref_count > 0' failed

1 Answer 1

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GDM Seems to be incompatible with Infinality. Running apt-get purge fontconfig-infinality and rebooting solved the problem.

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