Hit:1 http://security.debian.org/debian-security bullseye-security InRelease Hit:2 http://ftp.debian.org/debian bookworm InRelease Hit:3 http://ftp.debian.org/debian bookworm-updates InRelease Err:4 https://enterprise.proxmox.com/debian/ceph-quincy bookworm InRelease 401 Unauthorized [IP: 51.79.228.122 443] Reading package lists... Done E: Failed to fetch https://enterprise.proxmox.com/debian/ceph-quincy/dists/bookworm/InRelease 401 Unauthorized [IP: 51.79.228.122 443] E: The repository 'https://enterprise.proxmox.com/debian/ceph-quincy bookworm InRelease' is not signed. 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.