Auto login root user at system start in Kali linux

And here are the simple steps to do it. Open and edit the file called /etc/gdm3/daemon.conf.

root@kali:~# leafpad /etc/gdm3/daemon.conf

In the daemon section uncomment the 2 lines for automatic login. It should finally look like this

[daemon]
# Enabling automatic login
  AutomaticLoginEnable = true
  AutomaticLogin = root

Done. Now reboot and enjoy.