Hi, I would need your help pls in updating the server with Nextcloud.
I run: apt update && apt full-upgrade
output:
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://packages.sury.org/php bullseye InRelease: The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key
W: Failed to fetch https://packages.sury.org/php/dists/bullseye/InRelease The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key W: Some index files failed to download. They have been ignored, or old ones used instead.
Do you want to continue? [Y/n] y
Err:1 https://packages.sury.org/php bullseye/main amd64 php-common all 2:94+0~20240205.51+debian11~1.gbp6faa2e 404 Not Found [IP: 185.180.12.68 443]
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php-defaults/php-common_94%2b0... 404 Not Found [IP: 185.180.12.68 443]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? ---

As I'm not clever in server stuff, jet!? I was searching and found this: https://github.com/MichaIng/DietPi/issues/4219 BUT it did not solve my problem! I guess it's an expired key? BUT I don't know How-To-Fix. I hope you will find time to help me to solve this so I can get my server updated.
Many THX
Regards Witzker
PS: as I intend also to update Debian to latest version - may be its good to to this and mayby the problen is gone with the Debian Update
what will you recommend?
Many THX