How to undo an upgrade in Proxmox

[sai.dasari]

I have accidentally ran apt-get dist upgrade -y two of our nodes instead of update.
Now I'm not able to delete VM's see any disks. Can anyone please helpme here on how to undo the upgrade. Worst part is I can't even see what was upgraded.
We are running a three node cluster. I ran this command on Node 1 and Node 3. Our admin gave this task to me to undo the upgrade as I screwed it up. I tried a lotof things But Can't undo it. This is my earlier post "https://forum.proxmox.com/threads/r...failed-2-no-such-file-or-directory-500.91716/"

Found the root cause as an unplanned upgrade.

 

[Hannes Laimer]

Hey,

what version of PVE did you run before the upgrade? And which is now installed? Do you have any error logs from the cluster? Since PVE is basically Debian, maybe [1] might work. Also, if versions of PVE instances within the cluster are too far apart the cluster will not work[2], so, depending on the installed versions, upgrading all instances could possibly fix the problems.

[1] https://www.cyberciti.biz/howto/debian-linux/ubuntu-linux-rollback-an-apt-get-upgrade/
[2] https://pve.proxmox.com/wiki/Cluster_Manager#_requirements