Proxmox VE 8 to 8.1 upgrade interrupted

Nov 27, 2023
Hi, I tried to upgrade my Proxmox VE servers from 8 to 8.1 and the process was interrupted. When I try to execute apt dist-upgrade now I get the following:

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

Reading package lists...
Building dependency tree...
Reading state information...
Calculating upgrade...
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
4 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up proxmox-kernel-6.5.11-4-pve-signed (6.5.11-4) ...
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/dkms 6.5.11-4-pve /boot/vmlinuz-6.5.11-4-pve
dkms: running auto installation service for kernel 6.5.11-4-pve.
Sign command: /lib/modules/6.5.11-4-pve/build/scripts/sign-file
Signing key: /var/lib/dkms/mok.key
Public certificate (MOK): /var/lib/dkms/

Building module:
Cleaning build area...
make -j24 KERNELRELEASE=6.5.11-4-pve -j24 -C /lib/modules/6.5.11-4-pve/build M=/var/lib/dkms/blksnap/ modules...(bad exit status: 2)
Error! Bad return status for module build on kernel: 6.5.11-4-pve (x86_64)
Consult /var/lib/dkms/blksnap/ for more information.
Error! One or more modules failed to install during autoinstall.
Refer to previous errors for more information.
dkms: autoinstall for kernel: 6.5.11-4-pve failed!
run-parts: /etc/kernel/postinst.d/dkms exited with return code 11
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/proxmox-kernel-6.5.11-4-pve-signed.postinst line 20.
dpkg: error processing package proxmox-kernel-6.5.11-4-pve-signed (--configure):
installed proxmox-kernel-6.5.11-4-pve-signed package post-installation script subprocess returned error exit status 2
dpkg: dependency problems prevent configuration of proxmox-kernel-6.5:
proxmox-kernel-6.5 depends on proxmox-kernel-6.5.11-4-pve-signed | proxmox-kernel-6.5.11-4-pve; however:
Package proxmox-kernel-6.5.11-4-pve-signed is not configured yet.
Package proxmox-kernel-6.5.11-4-pve is not installed.
Package proxmox-kernel-6.5.11-4-pve-signed which provides proxmox-kernel-6.5.11-4-pve is not configured yet.

dpkg: error processing package proxmox-kernel-6.5 (--configure):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of proxmox-default-kernel:
proxmox-default-kernel depends on proxmox-kernel-6.5; however:
Package proxmox-kernel-6.5 is not configured yet.

dpkg: error processing package proxmox-default-kernel (--configure):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of proxmox-ve:
proxmox-ve depends on proxmox-default-kernel; however:
Package proxmox-default-kernel is not configured yet.

dpkg: error processing package proxmox-ve (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)

Best regards,

David Johnson
Looks like blksnap does not support the current proxmox kernel. What is it and why have you installed it?
blksnap/now all [installed,local]

Ah, that was it. I had installed the veeam package to try to backup the server and it installed blksnap at that time. I removed blksnap and the upgrade was able to complete successfully. Thanks so much for your help!

Last edited:
Oh yes, I read on reddit that you have to update the veeam client, too. Never version will include support for Kernel 6.5


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