Installing Spotify from MXPI, I got an error similar to this:
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W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://repository.spotify.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D1742AD60D811D58
E: http://repository.spotify.com stable InRelease is not (yet) available (The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D1742AD60D811D58)
Add the key manually with this command as root (I have tested and it worked for me...others please verify):
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curl -sS https://download.spotify.com/debian/pubkey_0D811D58.gpg | sudo apt-key add -
All the best,
-Paul..