The "Bootable" legacy ISO you've used is in fact not bootable, it relies on CDROM emulation provided by BIOS. VMs don't usually do this sort of emulation. If you set the guest OS to something like ...
Open VirtualBox Select the guest OS, but don't launch it. Click on the Settings button. Go to System > Motherboard > Boot Order Select an entry (e.g Hard Disk, USB, or DVD drive) and use the arrow ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results