✅ Fixing GPG Key Error on Kali Linux (Modern Method)

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When running `sudo apt update` on Kali Linux, you might face a GPG key error like this:


Get:1 http://kali.download/kali kali-rolling InRelease [41.5 kB]
Err:1 http://kali.download/kali kali-rolling InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ED65462EC8D5E4C5
Reading package lists... Done
W: GPG error: http://kali.download/kali kali-rolling InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ED65462EC8D5E4C5
E: The repository 'http://http.kali.org/kali kali-rolling InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

This means Kali's signing key is missing from your system.

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🔧 Solution (Manual Modern Method)

Follow these steps to resolve the issue by fetching and adding the missing GPG key.

1. Download the GPG Key from Kali’s Official Server

curl -fsSL https://archive.kali.org/archive-key.asc -o kali-archive-key.asc

2. Add the Key to APT’s Trusted Keyring

sudo gpg --dearmor < kali-archive-key.asc | sudo tee /etc/apt/trusted.gpg.d/kali.gpg > /dev/null

3. Remove the Downloaded Key File (Optional)

rm kali-archive-key.asc

4. Update the Package List Again

sudo apt update

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✅ Result

The update should now work without GPG key errors.

Hit:1 http://kali.download/kali kali-rolling InRelease
Reading package lists... Done

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📌 Notes

• This method is cleaner and aligns with current best practices for GPG key management in Debian-based systems.
• Always make sure the key you're importing is from a trusted source.