penso che il problema sia una chiave scaduta:
codice:
# apt-get update --fix-missing
Hit:1 http://security.debian.org/debian-security bullseye-security InRelease
Hit:2 http://deb.debian.org/debian bullseye InRelease                                                                       
Hit:3 http://deb.debian.org/debian bullseye-updates InRelease                                                               
Get:4 https://packages.sury.org/php bullseye InRelease [7,551 B]                                                            
Err:4 https://packages.sury.org/php bullseye InRelease                                                
  The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key <deb@sury.org>
Hit:5 https://packages.gitlab.com/runner/gitlab-runner/debian bullseye InRelease
Reading package lists... Done
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 <deb@sury.org>
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 <deb@sury.org>
W: Some index files failed to download. They have been ignored, or old ones used instead.
ho provato a fare il renew senza successo:
codice:
# apt-key adv --keyserver keys.gnupg.net --recv-keys B188E2B695BD4743
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
Executing: /tmp/apt-key-gpghome.fHdlvFBiFi/gpg.1.sh --keyserver keys.gnupg.net --recv-keys B188E2B695BD4743
gpg: keyserver receive failed: Server indicated a failure