I am trying to update and get all these certificate errors. See below
~$ sudo apt update
Hit:1 http://deb.debian.org/debian bullseye InRelease
Hit:2 http://deb.debian.org/debian buster InRelease
Ign:3 https://repo.pureos.net/pureos byzantium InRelease
Ign:4 https://repo.pureos.net/pureos byzantium-security InRelease
Ign:5 https://repo.pureos.net/pureos byzantium-updates InRelease
Ign:6 https://repo.pureos.net/pureos amber InRelease
Ign:7 https://repo.pureos.net/pureos amber-security InRelease
Ign:8 https://repo.pureos.net/pureos amber-updates InRelease
Err:9 https://repo.pureos.net/pureos byzantium Release
Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 138.201.228.45 443]
Err:10 https://repo.pureos.net/pureos byzantium-security Release
Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 138.201.228.45 443]
Err:11 https://repo.pureos.net/pureos byzantium-updates Release
Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 138.201.228.45 443]
Err:12 https://repo.pureos.net/pureos amber Release
Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 138.201.228.45 443]
Err:13 https://repo.pureos.net/pureos amber-security Release
Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 138.201.228.45 443]
Err:14 https://repo.pureos.net/pureos amber-updates Release
Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 138.201.228.45 443]
Reading package lists… Done
E: The repository ‘https://repo.pureos.net/pureos byzantium Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository ‘https://repo.pureos.net/pureos byzantium-security Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository ‘https://repo.pureos.net/pureos byzantium-updates Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository ‘https://repo.pureos.net/pureos amber Release’ no longer has a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository ‘https://repo.pureos.net/pureos amber-security Release’ no longer has a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository ‘https://repo.pureos.net/pureos amber-updates Release’ no longer has a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
What is going on?