Are you running a non-linux OS?
Umbrel apps (including the umbrel app) are just dockerfiles, so it already runs in a "vm" but it does make assumptions about the operating system so I guess if you're not on a compatible OS you'd need to run a vm.
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Nah, would likely use Debian. I have looked at Proxmox actually.
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Proxmox is based on Debian. In fact you can install it on top of a base Debian Install.
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