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Gillian
Asked: 2018-10-21 10:18:20 +0800 CST

Dual Boot Windows 10 and Kubuntu - SATA AHCI vs RAID [error]

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I dual installed Kubuntu on a computer with Windows 10, grub is on /dev/sda while the Windows boot manager is on /nvmesomethingsomething.

To install it, I had to set SATA from RAID to AHCI in the UEFI BIOS Setup. With SATA AHCI the boot of Kubuntu works. But when I try to boot into Windows, I get a BSOD with INACCESSIBLE_BOOT_DEVICE.

If in UEFI, and I select RAID instead of AHCI, I can boot into Windows, but Kubuntu's boot process results in me ending up in an initramfs terminal.

So I can get only one or the other, but never both working systems.
Is there any solution?

grub2 dual-boot raid uefi ahci

2 Answers

  1. Probably you have to update your bootmanager, because, it points to disappearing path, that is:

    • when Windows was installed in RAID mode, thus the bootmanager point to /nvme but when you switch to AHCI /nvme is destroyed and replaced by something else.
    • in the same way, when you installed Kubuntu in AHCI mode, it was installed on /dev/sda but when you switch back to RAID, it is destroyed.

    OT: why did you need to install Kubuntu without RAID?

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  2. I ran into the same issue. When I was installing Ubuntu I switched RAID to AHCI. I followed internet article but my Windows stopped loading. Okay, I reinstalled Windows (it was clean) and then it was all right for about two months.

    About two days ago I tried to switch Nvidia drivers in Ubuntu and did some updates. It worked well till evening. Next morning it loaded into initramfs console. Then I found out that with RAID setting I can use only Windows, Ubuntu loads in initramfs console. With AHCI I was able to run Ubuntu and Windows loads into blue screen INACCESSIBLE_BOOT_DEVICE. With RAID I wasn't able to see devices from LiveCD (so I was not able to install Ubuntu in RAID).

    I solved the problem switching my Windows to AHCI mode. Solution is here: http://triplescomputers.com/blog/uncategorized/solution-switch-windows-10-from-raidide-to-ahci-operation/

    In short,

    1. Run cmd from administrator,
    2. bcdedit /set {current} safeboot minimal
    3. Reboot
    4. Change RAID to AHCI in BIOS
    5. Start Windows (it will start in safe mode)
    6. Run cmd from administrator,
    7. bcdedit /deletevalue {current} safeboot
    8. Reboot.
    9. Profit!

    Now my Windows 10 and Ubuntu 21.04 start well.

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