I am getting an errfor when updating. It might be the new NVIDIA driver?

Anyone have the same problem?

sudo pkcon refresh
Refreshing cache [=========================]
Loading cache [=========================]
Downloading packages [=========================]
Running [=========================]
Finished [=========================]
Fatal error: W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ddebs.ubuntu.com focal Release: The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) <ubuntu-archive@lists.ubuntu.com>
E: http://ddebs.ubuntu.com focal Release.gpg is not (yet) available (The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) <ubuntu-archive@lists.ubuntu.com>)
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ddebs.ubuntu.com focal-proposed Release: The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) <ubuntu-archive@lists.ubuntu.com>
E: http://ddebs.ubuntu.com focal-proposed Release.gpg is not (yet) available (The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) <ubuntu-archive@lists.ubuntu.com>)
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ddebs.ubuntu.com focal-updates Release: The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) <ubuntu-archive@lists.ubuntu.com>
E: http://ddebs.ubuntu.com focal-updates Release.gpg is not (yet) available (The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) <ubuntu-archive@lists.ubuntu.com>)

I don't understand why these keys suddenly is missing from my db. Is it safe to try and add them?

Err:27 http://ddebs.ubuntu.com focal Release.gpg
The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) <ubuntu-archive@lists.ubuntu.com>
Err:28 http://ddebs.ubuntu.com focal-proposed Release.gpg
The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) <ubuntu-archive@lists.ubuntu.com>
Err:17 http://ddebs.ubuntu.com focal-updates Release.gpg
The following signatures were invalid: EXPKEYSIG C8CAB6595FDFF622 Ubuntu Debug Symbol Archive Automatic Signing Key (2016) <ubuntu-archive@lists.ubuntu.com>
Get:29 http://security.ubuntu.com/ubuntu focal-security/main amd64 DEP-11 Metadata [24,2 kB]

Do you need the ddeb archive (used for debugging symbols iirc)? These are not usually included or needed, and have to be added by the user, so unless you are using them for something, you can remove them. ..

otherwise, you can disable them, them update your system, which should include new gpg keys for the ddeb repo to replace the expired ones, the re-enable them if needed.

https://bugs.launchpad.net/ubuntu/+sour ... ug/1920640
There is a workaround here as well