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Trying to update Linux Mint 21.3 before I start upgrading to 22

sudo apt update fails with:

Err:2 https://brave-browser-apt-release.s3.brave.com stable InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0686B78420038257

However, I had uninstalled the Brave Browser previously by right-clicking on its menu listing and choosing uninstall.

sudo apt update autoremove after a reboot did not solve the problem.

How may I successfully update my system?

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If that’s the only error, then you have successfully updated the local copies of the repository indexes you care about. apt update updates everything it can; errors related to a repository only affect that specific repository, nothing else.

To avoid the error, look for references to brave.com in /etc/apt/sources.list and files in /etc/apt/sources.list.d, and remove them.

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  • No reference in /etc/apt/sources.list Removed file in /etc/apt/sources.list.d/ Solved problem. Commented Jul 31, 2024 at 7:03

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