Could not read username for. No bootable medium found virtualbox. system halted. no bootable medium found? please insert a bootable medium and reboot.. fatal could not read from the boot medium system halted virtualbox.

Could not read username for. No bootable medium found virtualbox. system halted. no bootable medium found? please insert a bootable medium and reboot.. fatal could not read from the boot medium system halted virtualbox.
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