Boot a live Linux system directly from a bootable USB device

[pwzhangz]

I can copy a persistent LiveUSB to a vdi file and create a VBox VM from there:

sudo VBoxManage convertfromraw -format VDI /dev/sdd u2004_live.vdi

However, how do I boot a live Linux system directly from a bootable USB device? That is, without first creating a multi-GB VM?

[scottgus1]

The old-school BIOS provided by Virtualbox does not support booting from USB.

The EFI BIOS might, but your guest OS would require compatibility with EFI, too.

[pwzhangz]

My version of VBox (6.1.6) has the feature to turn on EFI compatibility. The guest system，Ubuntu 20.04LTS，of course, also supports EFI.