Proxmox not booting up anymore (zfs error)

[wirdo02]

Hi Guys,

I've been working on our internal system and have messed things up quite bad.
I accidentally added the 'buster' repository to my stretch installation and then updated all packages.

When rebooting an error comes up: zpool: symbol lookup error: /lib/libzfs.so.2: undefined symbol: efi_rescan
And the system goes into busybox right after.

I've booted from a livecd (ubuntu 16.04) and mounted everything and did a chroot.
Then tried to run apt-get update, upgrade and dist-upgrade but without succes since it keeps trying (and failing) to install a kernel.

Setting up pve-kernel-4.15.18-12-pve (4.15.18-36) ...
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.15.18-12-pve /boot/vmlinuz-4.15.18-12-pve
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.15.18-12-pve /boot/vmlinuz-4.15.18-12-pve
update-initramfs: Generating /boot/initrd.img-4.15.18-12-pve
run-parts: executing /etc/kernel/postinst.d/pve-auto-removal 4.15.18-12-pve /boot/vmlinuz-4.15.18-12-pve
run-parts: executing /etc/kernel/postinst.d/zz-pve-efiboot 4.15.18-12-pve /boot/vmlinuz-4.15.18-12-pve
Re-executing '/etc/kernel/postinst.d/zz-pve-efiboot' in new private mount namespace..
No /etc/kernel/pve-efiboot-uuids found, skipping ESP sync.
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.15.18-12-pve /boot/vmlinuz-4.15.18-12-pve
zpool: symbol lookup error: /lib/libzfs.so.2: undefined symbol: efi_rescan
/usr/sbin/grub-probe: error: failed to get canonical path of `rpool/ROOT/pve-1'.
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/pve-kernel-4.15.18-12-pve.postinst line 19.
dpkg: error processing package pve-kernel-4.15.18-12-pve (--configure):

Anyone has an idea?
Thanks for your time.

 

[wirdo02]

I've decided to do a complete re-install as soon as the zfs snapshots are done copying to an external drive.
Nothing seems to be working correctly anymore and I don't want to waste your time on this since it's not a productional server.

I've been looking through the forums to see how to recover a vm from an zfs snapshot but cannot find anything.
Could you please inform me on the process of recovering with an zfs snapshot? I've used the send/receive command to process them.

I've made a snapshop of each VM disk (example VM-100-disk-0) and got these on a external zfs disk.
Got the VM config files as well.