Apt update failing w/ unavailable public key - has the signing key changed in the last few days?

[user-name-cannot-be-blank]

Get:6 http://labs.consol.de/repo/stable/ubuntu jammy InRelease [21.3 kB]
Err:6 http://labs.consol.de/repo/stable/ubuntu jammy InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F0CA212FF1FFE778

[jstark1]

It looks like the repositories are now uniformly signed with GPG-KEY-4096, which makes sense. I think the repo pages at https://labs.consol.de/repo/ should be adapted accordingly.

[sni]

right, i switched to the 4096bit key for all repositories yesterday but haven't found time to make an announcement yet.
The repository page should have been updated already and point to the new key.

[jstark1]

For cosmetics, I would suggest storing the keys uniformly in /etc/apt/trusted.gpg.d/ as .asc on Debian/Ubuntu.