Kali Linux: On install, designated root password cannot login - incorrect password

Try this in login window:

Username: root
Password: password

the "root" is exactly word "root", means root user

the "password" is the password you created during installation.

From: https://forums.kali.org/showthread.php?18428-Username-PW-login-failure-to-Kali-Linux

Boot your machine with a live CD, mount your hard drive, chroot to your hard drive and change password.

Reboot without the live CD, now your new password should give you access.

I found a way to get around the problem, try this as it worked for me: in the terminal type

sudo su

it will ask for your userpassword and make you root/superuser

some operating systems do not like you to login as root