apt-get update issue in Kali

Solution 1:

Yes, there appears to be issues with Kali Linux WSL (not downloaded from Microsoft Store).

The Kali archive keys appear to be missing and cannot be installed using apt-add key since it relies on GnuPG, which cannot be installed using apt, since the signatures cannot be verified.

The best solution is the one submitted by Jim which installed the Kali archive keys from a Debian package. Once this is done apt update and apt upgrade will work.

• Download the Debian package for the Kali archive keys wget -O kali-archive-keyring_2020.2_all.deb https://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_2020.2_all.deb
• Install the Kali archive key package sudo dpkg -i kali-archive-keyring_2020.2_all.deb
• Update list of available packages from Kali repo sudo apt update
• Upgrade the WSL system sudo apt full-upgrade

Solution 2:

I did not alter /etc/apt/sources.list.

I solved the "An error occurred during the signature verification" with the following commands (run from root):

wget --no-check-certificate https://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_2020.2_all.deb

dpkg -i kali-archive-keyring_2020.2_all.deb

apt update

Solution 3:

Manually download and install the needed package to verify the signature:

wget https://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_2020.2_all.deb
sudo dpkg -i kali-archive-keyring_2020.2_all.deb

Then apt update and apt upgrade should work as expected.