Re-edit the pveapthook configuration file, remove all the "#" comments inside, save and exit. You can reboot here.

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Article Abstract

During the process of upgrading Proxmox VE 7.4 to 8.1 on an idle server, the upgrade failed due to an error in the pve-apt-hook script. The issue was traced back to the residual effects of previously installed Ceph-related dependencies. By editing the pve-apt-hook configuration file to comment out lines, installing missing dependencies such as librados2 step-by-step, and repairing the dependency chain, the upgrade was finally completed. Practice has proven that cross-version upgrades require careful handling of dependencies. It is recommended to back up virtual machines before upgrading production environments, and direct major version upgrades are not recommended for non-essential scenarios; a clean installation can be preferred to avoid risks.

Qwen3-14B · 2026-06-18

Today, on a whim, I wanted to upgrade PVE 7.4-17 on my idle server to the latest PVE 8.1, mainly to pave the way for my Intel CPU mini PC first. After all, production equipment cannot be upgraded casually; it would be a disaster if it failed.

I will skip the previous steps, as they are not the main focus, and there are already many tutorials online. You can refer to this blogger's article:Proxmox VE (PVE) 7.X to 8.0 Upgrade Tutorial。

The key issue occurred when running the critical step, executing the following command to upgrade to PVE 8.0:

apt dist-upgrade -y

As a result, the error shown in the figure below occurred, causing the upgrade to 8.0 to fail:

This might be related to some Ceph dependencies I modified when I was planning to study Ceph earlier. Anyway, once a problem arises, it must be solved. After searching the internet for a long time, I finally resolved it. Here, I will record the troubleshooting steps.

Edit the pveapthook configuration file

vim /etc/apt/apt.conf.d/10pveapthook

As shown below, then save and exit:

Run the following commands in sequence

dpkg --configure -a
apt-get --fix-broken install
apt full-upgrade

apt-get --fix-broken install

apt-get install librbd1=16.2.11+ds-2

Check the dependencies of librbd1

apt-get install librbd1=16.2.11+ds-2

apt-get install librados2=16.2.11+ds-2

First install the required dependency librados2:

apt-get install librbd1=16.2.11+ds-2  
apt-get install python3-ceph-argparse=16.2.11+ds-2  
apt-get install python3-ceph-common=16.2.11+ds-2  
apt-get install python3-cephfs=16.2.11+ds-2
apt-get install python3-rbd=16.2.11+ds-2

Then install the following dependencies in sequence:

apt-get install librbd1=16.2.11+ds-2

apt-get install libcephfs2=16.2.11+ds-2
apt-get install python3-rados=16.2.11+ds-2

apt-get install python3-ceph-common=16.2.11+ds-2

apt-get install python3-cephfs=16.2.11+ds-2

apt-get install --reinstall proxmox-ve

If an error occurs during a certain step of the installation, install the missing dependencies first, just like in the previous section. For example, I encountered an error when installing the 4th item:

So I ran the following command first to install the missing dependencies:apt dist-upgrade -yapt-get install libcephfs2=16.2.11+ds-2