Proxmox 9.0.3 Fails to check for updates apt-get update failed with exit code 100

Aug 31, 2025
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I have update to Proxmox 9.0.3 by a clean installation and reissued my license to it. At the moment I get every morning a email notification that apt-get update failed with exit code 100. I tried to clean the lists with rm /var/lib/apt/lists/* -r but that doesn't solve the issue.

Does anyone have an Idea what is going wrong?

starting apt-get update
Get:1 http://deb.debian.org/debian trixie InRelease [138 kB]
Get:2 http://security.debian.org/debian-security trixie-security InRelease [43.4 kB]
Get:3 http://deb.debian.org/debian trixie-updates InRelease [47.1 kB]
Get:4 http://security.debian.org/debian-security trixie-security/main amd64 Packages [33.1 kB]
Get:5 http://security.debian.org/debian-security trixie-security/main Translation-en [22.0 kB]
Get:6 http://deb.debian.org/debian trixie/main amd64 Packages [9668 kB]
Get:7 http://deb.debian.org/debian trixie/main Translation-en [6484 kB]
Get:8 http://deb.debian.org/debian trixie/contrib amd64 Packages [53.8 kB]
Get:9 http://deb.debian.org/debian trixie/contrib Translation-en [49.6 kB]
Get:10 http://deb.debian.org/debian trixie/non-free-firmware amd64 Packages [6868 B]
Get:11 http://deb.debian.org/debian trixie/non-free-firmware Translation-en [4704 B]
Get:12 http://deb.debian.org/debian trixie-updates/main amd64 Packages [2432 B]
Get:13 http://deb.debian.org/debian trixie-updates/main Translation-en [396 B]
Err:14 https://enterprise.proxmox.com/debian/ceph-squid trixie InRelease
401 Unauthorized [IP: 51.91.38.34 443]
Err:15 https://enterprise.proxmox.com/debian/pve trixie InRelease
401 Unauthorized [IP: 51.91.38.34 443]
Reading package lists...
E: Failed to fetch https://enterprise.proxmox.com/debian/ceph-squid/dists/trixie/InRelease 401 Unauthorized [IP: 51.91.38.34 443]
E: The repository 'https://enterprise.proxmox.com/debian/ceph-squid trixie InRelease' is not signed.
E: Failed to fetch https://enterprise.proxmox.com/debian/pve/dists/trixie/InRelease 401 Unauthorized [IP: 51.91.38.34 443]
E: The repository 'https://enterprise.proxmox.com/debian/pve trixie InRelease' is not signed.
TASK ERROR: command 'apt-get update' failed: exit code 100

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Contact Proxmox sales office or where you bought the support subscription directly, or open a (free) support ticket for this (via your shop account). The volunteers on this forum cannot really help with subscription issues but the (re)seller can.
EDIT: Sometimes it can take a little time and it's currently weekend in Europe.
 
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