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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
Why not just use the prebuilt appliance here;
https://neverware.zendesk.com/hc/en-us/articles/214564457--UPDATED-Un-Official-CloudReady-Virtual-Machine-Images-
Then just import it to VirtualBox or VMWare?