[Solved] The Following Signatures were Invalid Kali Linux Repo | Key Expired | apt-get update

 Note : Solution to this problem is available below under heading SOLUTION 

Want to fix Invalid signature when trying to apt-get update on Kali Linux ? ? ?

Error message while trying to run apt-get update, is like below :

http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease
The following signatures were invalid: KEYEXPIRED 1517583136 Kali Linux Repository
Reading package lists... Done

OR LIKE BELOW
The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository

SOLUTION (run following in terminal of kali)

wget -q -O - https://archive.kali.org/archive-key.asc | apt-key add

See image below :


Still having issue ??? SEE video step by step guide below : 


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