Kali Linux is a Debian-based distribution. Contains a very large collection of security tools and penetration tests.
The project just released a new version for the year 2020 and it brings a number of important changes. The new version, 2020.1, of Kali Linux merges the various desktop editions into a single download option and removes the ability to run various as root from beforechoice.
“Throughout the history of Kali (and its predecessors BackTrack, WHAX and Whoppix), the default credentials have been root/toor. This is no longer the case. We no longer use him account superuser, root, as 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 large one change, and the developers ask that you report if you encounter any problem.
Download the new version (SHA256):
kali-linux-2020.1-live-amd64.iso (2,811MB, torrent sites),
kali-linux-2020.1-installer-amd64.iso (2,016MB, torrent sites).