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Download the NeverWare's ChromeOS build from http://www.neverware.com/freedownload
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Extract the *.bin.zip
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Convert it to VDI.
vboxmanage convertdd chromiumos_image.bin chromiumos_image.vdi
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mv chromiumis_image.vdi C:\t\v\chromeos\
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Create a VM with settings:
- Guest OS type: Linux/Other Linux
- 2048 RAM
- Use existing chromiumos_image.vdi as hard disk
- Enable EFI (special OSes)
- Enable PAE/NX
- change pointing device to PS/2 Mouse
- Start the VM
Using virtualbox 6.0.14 on Manjaro and the original method in this gist, I had the same boot to a black screen issue. Presumably because of the graphics issue that Neverware warn about.
I changed the virtualbox VM graphics controller from the default VMSVGA to VBoxVGA and then I managed to get the splash screen to show briefly but then it goes black again. The shortcut to get to the dev console works but after a few seconds the VM seems to go back to the black screen. Not sure if that's a bootloop or that's how the chromium dev console works (if you're not fast enough to select an option).
There's also a warning about the VBoxVGA graphics adapter being deprecated so it's not a long term solution even if it did work better.