If VirtualBox is not booting from ISO or if GParted ISO is not mounting, correct the Boot Order in System Settings and verify ...

I don't think Virtualbox has a UEFI option, so I think virtualbox is (rightly) booting legacy. But still it can't boot from that ISO I just tried VMWare Player I notice that one can choose UEFI or not ...

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 ...

Out of curiosity I thought I'd check if the distro already on another drive (an HDD) runs. Hooked it up, turned on the laptop and pressed Esc to open the boot menu to make certain I'd be booting from ...