I tried to add
deb http://ftp.debian.org/debian stretch-backports main
And run
sudo apt-get update
But it gives the error:
NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010
This started today because it used to work fine, what is the reason for this?
I am using a raspberry pi on Debian 9
Perhaps this question is a little bit too Debian-related to be asked on this forum. I think a Debian-specific forum would give you a faster answer.
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It looks like
might help you (I wonder if this is a pervasive error for people following the instructions to install Certbot from backports?).
Also, we should probably suggest a more official way to get the correct package-signing PGP key fingerprint than someone’s personal blog. 
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