Is there a default password of Kali Linux OS after first installation?

I installed Kali Linux OS on my hard disk and set nothing as username and password. Now at the time of login it ask for localhost username and password. I tried root and toor as default but didn’t worked for me.

I had the same issue. However I did remember entering a password and most default username for Debain flavors are root.

So try:

• Username: root
• Password: toor (or the password you entered at installation)

Kali Linux Default root Password is toor

Default root Password

During installation, Kali Linux allows users to configure a password for the root user. However, should you decide to boot the live image instead, the i386, amd64, VMWare and ARM images are configured with the default root password – “toor“, without the quotes.

Source Kali Linux Default Passwords

Just encountered the same problem with a fresh Kali Linux install. I chose to disable root login, and create a user account instead. Don’t remember giving a root password

But here’s an easy workaround to jump straight into a root-shell without the password:

sudo su -

simple as that, now you’re free to change your root password:

passwd

I went to boot menu and selected the “recovery mode.” There I used passwd command to set new credentials to my root account.

I had the same problem but tried something else. If you entered the root password at the beginning of installation then enter root as the user, and the root password you entered at the start of installation. That should work.