That's true, but there may be some some desktop BIOSes that will fail to boot without a display adapter—though I've had good luck on that on the few hosts I've made headless servers.
Fortunately the BIOSes shipping in hypervisors tend to be more sane, and QEMU for example can direct-boot a linux kernel without even needing to emulate a BIOS/EFI first.
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That's true, but there may be some some desktop BIOSes that will fail to boot without a display adapter—though I've had good luck on that on the few hosts I've made headless servers.
Fortunately the BIOSes shipping in hypervisors tend to be more sane, and QEMU for example can direct-boot a linux kernel without even needing to emulate a BIOS/EFI first.