Kali Linux use GDM3 as a default Display Manager. First confirm that your Kali Linux is set to use GDM3 as a default display manager:

# cat /etc/X11/default-display-manager


Next, edit /etc/gdm3/daemon.conf configuration file and uncomment the following two lines:

AutomaticLoginEnable = true
AutomaticLogin = root


Once you have made the above change simply reboot your Kali Linux to confirm your configuration.

# reboot


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