If anyone is using a Kali Live pendrive, they probably noticed that in versions 2025.1a, 2024.4 and older:
sudo apt update
sudo apt upgrade
have stopped working..
(Kali Live 2025.1c and 2025.2 already have this fixed, but in turn have other bugs that prevent their normal use)
How to “fix” it the fastest way?
We need to disable private-public key verification.
(On a regular installed Kali on disk, don’t do it)
sudo nano /etc/apt/sources.list
select [trusted=yes]
and copy and paste to 2nd and 3rd row like:
Remember that you have to do this every time you restart the Kali Live pendrive when you want to use apt update or upgrade.
If you want to have it permanently done, you’ll have to create a bootable pendrive ISO, but that’s a topic for a separate thread.
Best Regards!