Kali Linux is a Debian-based distribution. Contains a very large collection of security tools and penetration tests.
The project has just released a new version for the year 2020 and brings a number of important changes. The new version, 2020.1, of Kali Linux, merges the various desktop editions into single download options and removes the ability to run multiple as root by default.
Throughout the history of Kali (and the predecessors of BackTrack, WHAX and Whoppix), the default credentials were root / toor. This is no longer the case. We no longer use the superuser, root account as the default in Kali 2020.1. The default user account is now a standard user with no privileges. ”
To read the reasons behind this move you can visit a previous post at blog of distribution.
This is a very big change, and the developers are asking you to report any problems.
Download the new version (SHA256):