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 ...
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 ...
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