Apt-Get Not Working? Unable to Locate Package? Signatures Were Invalid Error Or Keyexpired Error?

if you are facing the error like above please follow this instruction to solve the problems.

Open your terminal and follow these instruction:

1. type: $ sudo -i 
2. type in your password (if asked)
3. type: $ touch /etc/apt/sources.list
4. type: $ chmod 644 /etc/apt/sources.list
5. type: $ echo "deb http://http.kali.org/kali kali-rolling main contrib non-free" > /etc/apt/sources.list
6. type: $ apt-key adv --keyserver hkp://keys.gnupg.net --recv-keys 7D8D0BF6
7. type: $  apt-get update

Now install whatever you are trying to install.

If the above doesn't work you can try this:

1. type: $ rm -rf /var/lib/apt/lists
2. type: $ apt-get update
3. type: $ apt-get install kali-archive-keyring

 Hope it will works for you!

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