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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 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.

How can I fix spotify?

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" By far the simplest way to handle this now is with Y-PPA-Manager (which now integrates the launchpad-getkeys script with a graphical interface).

  1. To install it, first add the webupd8 repository for this program:

    sudo add-apt-repository ppa:webupd8team/y-ppa-manager

  2. Update your software list and install Y-PPA-Manager:

    sudo apt-get update sudo apt-get install y-ppa-manager

  3. Run y-ppa-manager (i.e. type y-ppa-manager then press enter key).

  4. When the main y-ppa-manager window appears, click on "Advanced."

  5. From the list of advanced tasks, select "Try to import all missing GPG keys" and click OK.

You're done! As the warning dialog says when you start the operation, it may take quite a while (about 2 minutes for me) depending on how many PPA's you have and the speed of your connection. "

--How do I fix the GPG error "NO_PUBKEY"?

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