if you also see the the below error during running kali linux apt update or apt install the i have solution for this problem.

Sub-process /usr/bin/sqv returned an error code (1), error message is: Missing key 827C8569F2518CC677FECA1AED65462EC8D5E4C5, which is needed to verify signature. Warning: GPG error: http://kali.download/kali kali-rolling InRelease: Sub-process /usr/bin/sqv returned an error code (1), error message is: Missing key 827C8569F2518CC677FECA1AED65462EC8D5E4C5, which is needed to verify signature. Error: The repository ‘http://http.kali.org/kali kali-rolling InRelease’ is not signed.

Are you getting the “Missing key 827C8569F2518CC677FECA1AED65462EC8D5E4C5” GPG error when running `sudo apt update` on Kali Linux? Don’t worry — this tutorial shows you exactly how to fix the GPG key verification error

$ sudo wget https://archive.kali.org/archive-keyring.gpg -O /usr/share/keyrings/kali-archive-keyring.gpg

you just have to type the above command and it will work for you.

if you still have problem you can watch this video.