Given I have spotify installed on my ubuntu system When i upgrade using:

sudo apt-get update

Then I get this error:

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 13B00F1FD2C19886

W: Failed to fetch http://repository.spotify.com/dists/stable/InRelease  

W: Some index files failed to download. They have been ignored, or old ones used instead.
  • Do you have some more questions, or want to set one answer as solution? – davidbaumann May 9 '18 at 14:23

This happen when somehow we'd lost the keys.

To solve i have executed the first step listed here https://www.spotify.com/de/download/linux/

| improve this answer | |

I had the same problem. Basically what you can do is handle it through Y-PPA-Manager. So please follow exact steps,

  1. sudo add-apt-repository ppa:webupd8team/y-ppa-manager to add webupd8 repository.
  2. sudo apt update
  3. sudo apt install y-ppa-manager
  4. y-ppa-manager to run the y-ppa-manager.
  5. Click on Advanced.
  6. Click on Try to import all missing GPG keys and click Ok. It will give you an alert when it's over.
  7. apt update
| improve this answer | |

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