Kali 2021 Fix
12 Apr 2021FIXED: Kali 2020.2 OVA VIRTUALBOX - HASH SUM MISMATCH
This fixes an issue with apt in Kali.
$ sudo bash
$ mkdir /etc/gcrypt
$ echo all >> /etc/gcrypt/hwf.deny
$ sudo apt-get update
There’s a good explanation of how this works here