The GPG key has simply expired, as of 2021-03-20:
$ wget -q http://ddebs.ubuntu.com/dists/focal-proposed/Release
http://ddebs.ubuntu.com/dists/focal-proposed/Release.gpg
$ gpg --verify Release.gpg Release
gpg: Signature made Fri 19 Mar 2021 04:52:53 AM CET
gpg: using RSA key 0xC8CAB6595FDFF622
gpg: Good signature from "Ubuntu Debug Symbol Archive Automatic Signing Key
(2016) <ubuntu-arch...@lists.ubuntu.com>" [expired]
gpg: Note: This key has expired!
Primary key fingerprint: F2ED C64D C5AE E1F6 B9C6 21F0 C8CA B659 5FDF F622
$ gpg --list-key 0xC8CAB6595FDFF622
pub rsa4096/0xC8CAB6595FDFF622 2016-03-21 [SC] [expired: 2021-03-20]
Key fingerprint = F2ED C64D C5AE E1F6 B9C6 21F0 C8CA B659 5FDF F622
uid [ expired] Ubuntu Debug Symbol Archive Automatic Signing
Key (2016) <ubuntu-arch...@lists.ubuntu.com>
Time to generate a new key and distribute it, I guess. :-)
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https://bugs.launchpad.net/bugs/1920610
Title:
The repository 'http://ddebs.ubuntu.com groovy Release' is not signed
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