Solved: APT GPG Error NO_PUBKEY

Twitter: @webpwnized
Thank you for watching. Please upvote and subscribe. This video solves the error message from APT that says "W: GPG error: -URL- InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY --KEY SIGNATURE--". The message is referring to how APT GPG keys are managed in the Linux system. The video shows the cause of the message, and how to manage public APT repository keys correctly 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 the NO_PUBKEY will vary per key. The URL right after GPG Error will also vary since this 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 upgrade to update the packages on Linux systems with sources from repositories signed by the repository keys. The issue can be caused by having expired public keys, missing public keys, or not using the signed-by directive to point the fetch commands to the public key.
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[@webpwnized]

Thank you for watching. Please upvote and subscribe.

[@lencumbow]

Thank you. I'm trying to install the samsung unified printer driver and I am having the same issue. Your video is likely to be helpful.