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After updating to debian buster, I've had trouble installing programs from 3rd party repositories (eg spotify, seadrive (for seafile), mono, mopidy). Excerpt from apt-get update:

W: 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
E: The repository 'http://repository.spotify.com stable InRelease' is not signed.

I understand it has to do with how apt handles keys, namely "preference for SHA-1 encryption has been turned off in APT".

Relevant apt-key list excerpt for spotify:

/etc/apt/trusted.gpg.d/spotify-2015-05-28-D2C19886.gpg     
------------------------------------------------------     
pub   rsa4096 2015-05-28 [SC] [expires: 2017-11-22]        
      BBEB DCB3 18AD 50EC 6865  0906 13B0 0F1F D2C1 9886   
uid           [ unknown] Spotify Public Repository Signing Key <operations@spotify.com>

apt-get update output: https://pastebin.com/sHFxAFvj

What do? Open tickets with the providers and for so long install with --allow-unauthenticated?

Note: this is not reproducing in a system that was dist-upgraded from stretch to buster.

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