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The GNOME image distributed from this site requires the user to login at boot.

Requiring a login is good for security, but often becomes burdensome during development when reboots are a routine occurance.

Fortunately, configuring autologin is a simple process.  First create the file /etc/pam.d/gdm-autologin with the following contents:

#
# access for autologin
#
auth     required       pam_nologin.so
auth     required       pam_permit.so
account  required       pam_unix.so
session  required       pam_permit.so

Next edit /etc/gdm/custom.conf so that the daemon section contains the following (it is empty by default):

[daemon]
AutomaticLoginEnable=true
AutomaticLogin=root

You can, of course, autologin as a user other than root.  Just substitute the desired username for root.

Your system will now autologin on the next boot.