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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?

  • You can install AHCI drivers in Windows, you should do that first before changing to AHCI to avoid the issue you are having. That is really a Windows issue, not directly related to Ubuntu. – oldfred Oct 20 '18 at 21:00

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