Can your VPS run Firecracker microVMs?
Firecracker needs /dev/kvm, and most VPS plans never pass it through. Check yours in three commands, read the result, and know what to run when it is missing.
#nested-virtualization
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VPS nested virtualization: can you run Proxmox?
Most VPS hosts hide the vmx flag. Check yours with kvm-ok in one minute, then run KVM or Proxmox guests, with the exact error strings you will see.