Kali Linux apt-get update Invalid Signature Solution
This Tip Show simply How to Solve Kali Linux apt-get update Invalid Signature Issue.
Especially relevant: this Solution has been found on stackexchange.com, but is presented here to confirm that it’s Working and to make quicker the solution.
Moreover, this is done also because so I can propose the Solution together with every frequently used apt-update directive whitout you need to search for.
cd && cd Downloads
wget https://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_2018.1_all.deb
sudo apt install ./kali-archive-keyring_2018.1_all.deb
sudo apt-get update