I wouldn't say it was stupid, but why are you ruling out ZFS?I have 2 Debian 13 systems, a server that was upgraded from Debian 12, and a work station that was a pure install of 13. The only slight oddity for both systems is that I run zfs, but I don't think this is material to the issue.
Can someone point me to where to look next, or point out what stupid thing I am doing?
https://wiki.debian.org/ZFS#InstallationInstallation
ZFS on Linux is provided in the form of DKMS source for Debian users. It is necessary to add the contrib section to your apt sources configuration to be able to get the packages. Also, it is recommended by Debian ZFS on Linux Team to install ZFS related packages from Backports archive. Upstream stable patches will be tracked and compatibility is always maintained. When configured, use following commands to install the packages:
sudo apt update
sudo apt install linux-headers-amd64
sudo apt install -t stable-backports zfsutils-linux
Future updates will be taken care by apt.
https://en.wikipedia.org/wiki/Dynamic_K ... le_SupportDynamic Kernel Module Support (DKMS) is a program/framework that enables generating Linux kernel modules whose sources generally reside outside the kernel source tree. The concept is to have DKMS modules automatically rebuilt when a new kernel is installed.[2]
I don't use ZFS, but I would guess that it is not installed correctly on one machine, meaning the kernel upgrade can't go ahead.
Please provide output of the following for both machines:
Code:
$ cat /etc/apt/sources.listAlso, please add a meaningful title to your topic to help other members with knowledge of the issue notice your post, and other users with the same issue find it from a web search.
I would suggest "Kernel not at latest version, possible ZFS issue?"
Statistics: Posted by FreewheelinFrank — 2026-01-11 07:40