It’s worth noting that Proxmox uses Debian. It’s essentially a collection of Debian packages, and you can install Proxmox on top of an existing Debian system: https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_13_Trixie
Proxmox lacks a Docker UI though, which is annoying. One of the reasons I’m using Unraid at home is because it supports KVM, LXC, and Docker, all in the same UI. (LXC is a plugin rather than being available out-of-the-box, but it works very well)
(and no, Proxmox’s new OCI container support isn’t it - that just converts the container to LXC and doesn’t handle upgrades)
Wow I didn’t realize 2.x was even still supported.