Proxmox web interface became unavailable and was not listening on port 8006. Also unable to backup a running KVM. This all pointed towards a missing/corrupt package.

To fix, the following was carried out:

1. Update repositories

nano /etc/apt/sources.list

Insert the relevant sources from here: http://pve.proxmox.com/wiki/Package_repositories#Proxmox_VE_No-Subscription_Repository – In this case it was the no subscription for Proxmox VE 4.x repositories.

Now run the following commands:

apt-get update
apt-get install pve-manager

Pve-manager seemed to be corrupt. Updating to the latest version fixed the issue.

Written by Matt Cooper
Hi, I'm Matt Cooper. I started this blog to pretty much act as a brain dump area for things I learn from day to day. You can contact me at: matt@linuxtutorial.co.uk.