Thank you for watching. Please vote and subscribe. This video resolves the APT error message stating /"W: GPG error: –URL– InRelease: The following signatures could not be verified because the public key is not available: NO_PUBKEY –KEY SIGNATURE–/". The message refers to how APT GPG keys are managed in the Linux system. The video shows the cause of the message and how to properly manage APT repository public keys to avoid this warning/error message in the future. The issue affects any version of Linux using the APT package manager with GPG public verification keys, including but not limited to Debian Linux, Ubuntu Linux, Kali Linux and others. The signature after NO_PUBKEY varies depending on the key. The URL right after the GPG error will also vary since it is the URL of the APT source code repository. APT is the package manager for Debian-based Linux distributions that uses commands like apt-get, apt-get install, apt update, apt-get update, apt dist-upgrade, apt update to update packages on Linux systems with repository sources. signed by the repository keys. The problem could be due to expired public keys, missing public keys, or not using the signed-by directive to point fetch commands to the public key.
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