Originally Posted by kansasnoob
If you didn't check this file out, please follow it first:
1. Open the file with editors whichever you'd like to use:
2. Add these options to that file like this:
gksu gedit /etc/gdm/custom.conf
3. Then save and reboot and check if your machine could accept "auto-login" as normally...
# GDM configuration storage
# See /usr/share/gdm/gdm.schemas for a list of available options.
# Enabling automatic login
AutomaticLoginEnable = true
AutomaticLogin = YOUR_ACCOUNT_NAME