

It depends on the project/container. Some containers run Debian, some Alpine, some Ubuntu. I mostly rely on the community scripts from here and use the defaults.
https://community-scripts.github.io/ProxmoxVE/
I guess everything that supports containers, QEMU and KVM is compatible to use as a guest OS in Proxmox.



It could also be a reference to the fact that Steam Deck can now install and download games while put in sleep mode. It’s in the latest Preview and Beta release of SteamOS.