Respostas:
Necessário apenas:
VBoxManage startvm "VM name" --type headless
Por exemplo:
VBoxManage startvm ubuservloc --type headless
VBoxManage controlvm "VM name" acpipowerbutton
VBoxManage list vms
.
Tente isso,
virtualbox startvm ubuservloc
Pare
VBoxManage controlvm "vm_name" poweroff
começar
nohup VBoxHeadless -startvm "vm_name" &
"C:\Program Files\Oracle\VirtualBox\VBoxHeadless.exe" --comment "linux_mint" --startvm "14f426cc-845d-46cb-9f6e-4dbb31a3769a"
VBoxHeadless --startvm "VM name"