A bootable device might be a CD, floppy, hard disk, or network device, as when booting with PXE.
To install an operating system, insert a bootable CD or floppy and restart the virtual machine by clicking the Reset button.
新建了几次都是这个鬼问题。
1.将floppy删除。
2.查看iso文件是否正确。
我的问题是iso镜像文件有问题。