[Solved] buster-backports public key is not available Raspberry pi 1b

Hello,

I installed Freedombox by this way: [debian wiki]/FreedomBox/Hardware/Debian
using Raspbian Buster Lite.

All is alright, but today I tried to install Coquelicot and I get this error:

Error during installation W: GPG error: http://deb.debian.org/debian buster-backports InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 04EE7237B7D453EC NO_PUBKEY 648ACFD622F3D138 E: The repository ‘http://deb.debian.org/debian buster-backports InRelease’ is not signed.

Solved after running:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 04EE7237B7D453EC
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 648ACFD622F3D138

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