[SOLVED] Severe issue with ZFS modules (Latest 6.2-10)

[PT400C]

Hello,

recently I followed this guide (https://github.com/angristan/wireguard-install) to install Wireguard on my Proxmox host Debian 10 machine. This worked fine and I used it back then. Days later I uninstalled Wireguard again, not noticing any problems.

But just as of today - I restarted the server - it seems like something with the Kernel (?) and ZFS broke. Executing

/sbin/modprobe zfs

I now get

modprobe: FATAL: Module zfs not found in directory /lib/modules/5.7.0-0.bpo.2-amd64

. That "bpo" part confuses me and I have no clue on how to proceed now. For a little reference, I installed Proxmox with the usual way, replacing a stock Debian 10 installation with it's Kernel.

Very much thanks in advance

PT400C

EDIT: It seems like that this installer messes with the Debian Backports repository (allowing my server to use that). Is there any way to reverse that process in case it is responsible for this outage?

 

[tom]

You do not run a Proxmox VE kernel.

=> Boot into Proxmox VE kernel (you can select on the kernel on boot splash) and remove the 5.7 kernel from Debian Backports.

 

[PT400C]

Thanks so much for your quick reply, tom! Could you maybe specify how I could do that with a headless machine? The server is located in a datacenter and not in my reach so far :/

EDIT: Is there maybe a way to mark this at runtime to boot into PVE the next time / startup?

EDIT2: Here's also a screenshot of my machine's boot directory (/boot)

EDIT3: The /build/grub.cfg also seems to be affected, it seems to use the .bpo. files.

 

[PT400C]

I used

grep -A100 submenu /boot/grub/grub.cfg |grep menuentry

and then combined the submenu and menuentry strings with ">" and saved that in the /etc/default/grub file. Example line:

GRUB_DEFAULT="gnulinux-advanced-5baf861f-8e11-421a-94f9-4e1efde0ccd6>gnulinux-5.4.55-1-pve-advanced-5baf861f-8e11-421a-94f9-4e1efde0ccd6"

After that I used

sudo update-grub

In case this will now have fixed the problem I might reopen this thread