Proxmox VE 1.X Proxmox VE 1.X includes : A complete operating system (Debian Lenny 64 bits) Partitioning of the disks using LVM2 Proxmox VE kernel, supporting OpenVZ (containers) and KVM (full virtualization) Utilities for making backups and restore data Web based administration interface The Version 1.x of Proxmox is no longer maintained since July 1st 2013 . We recommend to reinstall your server using the latest version available. Update to version 2.X / 3.X If you are still using version 1.x, we recommend to reinstall your server using the latest version available If you want to update it manually (which is not recommended), you need to upgrade it to version 2 in a first step and to version 3 in a second. Update from version 1.9 to 2.x Update from version 2.3 to 3.x