the RAID configuration however is totally independent from the BIOS hack. Means you can switch RAID setup on in the unhacked BIOS, reboot and do all configuration there, like breaking and rebuilding the RAID volume - if you so wish. But where did you read Ubuntu would mess up the raid? I don't think it would? Windows 10 did that in some cases - in its early days, but AFAIK they fixed that later on. You can delete the partitions on the volume but the volume itself should stay intact. Then create the Linux partitions on the existing volume. You can also create 2 or more partitions e.g. for a multi boot. And remember you can always change the SSDs, and even get rid of RAID altogether, even without tinkering with the BIOS hack (where you could actually brick your VAIO).