[PD] Signature problem verifiation problem on Debian Testing

Johan Mazel johan.mazel at gmail.com
Thu Aug 6 20:40:38 CEST 2020

I followed instruction from https://puredata.info/docs/faq/debian.
I added "deb http://apt.puredata.info/releases stable main" in
I used the stable keyword instead of testing because adding "deb
http://apt.puredata.info/releases testing main" (as specified in
https://puredata.info/docs/faq/debian) yields some errors. There is indeed
no testing directory in http://apt.puredata.info/releases/dists/.
I then did both "sudo apt-key adv --keyserver keyserver.ubuntu.com
--recv-key 9f0fe587374bbe81" and "sudo apt-key adv --keyserver
keyserver.ubuntu.com --recv-key D63D3D09C39F5EEB".

When I do "sudo apt update", I get this error at the end:
Ign:3 http://apt.puredata.info/releases stable InRelease
Get:5 http://apt.puredata.info/releases stable Release [4870 B]
Get:7 http://apt.puredata.info/releases stable Release.gpg [904 B]
Ign:7 http://apt.puredata.info/releases stable Release.gpg
W: GPG error: http://apt.puredata.info/releases stable Release: The
following signatures were invalid: EXPKEYSIG 9F0FE587374BBE81
Hans-Christoph Steiner <hans at guardianproject.info>
E: The repository 'http://apt.puredata.info/releases stable Release' is not
N: Updating from such a repository can't be done securely, and is therefore
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration

Is it a known problem?
Did I make a mistake somewhere?

Thank you for your time.

Best regards,
Johan Mazel
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