The Kali Linux distribution is going to switch to a new security model by defaulting to a non-root user starting with the upcoming 2020.1 release.

There has been considerable progress made since the last time I tried a variety of Linux distributions other than Raspbian on the Raspberry Pi, so I've given four of them another try.

Offensive Security warned Kali Linux users to manually install a new Kali repository signing key to avoid experiencing update failures.