How to Fix Spotify ‘No PubKey’ Error on Ubuntu

Do you use the official Spotify DEB on Ubuntu (or an Ubuntu-based Linux distribution like Linux Mint)? If so, you’ll be used to receiving updates to the Spotify Linux client direct from the official Spotify APT repo, right alongside all your other DEB-based software. Thing is: if you haven’t checked for updates from the command line recently you might not be aware the that security key used to ‘sign’ packages from the Spotify APT repo stopped working at the end of last year. Annoying, but not catastrophic as it—thankfully—doesn’t stop the Spotify Linux app from working just pollutes terminal output
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https://www.omgubuntu.co.uk/2025/02/fix-spotify-gpg-error-not-signed-ubuntu-linux-mint