public key not avaible

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public key not avaible

xxxdinfar
Newbie

i get this error in peppermint os when typing sudo apt-get update in terminal:
GPG error: http://repository.spotify.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A87FF9DF48BF1C90
E: The repository 'http://repository.spotify.com stable InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

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