install of Ubuntu25 on Windows 11

[Liam Proven]

On Fri, 12 Dec 2025 at 09:27, Gary Kirkpatrick via ubuntu-users
<ubuntu-users at lists.ubuntu.com> wrote:
>
> I have installed Ubuntu 25 with a Windows 11 dual boot.  However I can not boot into Windows 11 without changing the bios to RST with Optane.  With RST enabled Ubuntu will not boot.  In Windows the message is "Inaccesible boot device" and something similar in Uvbuntu25..

If Windows expects Intel RST, it won't boot -- but Ubuntu can't use Intel RST.

It is possible to force Windows to reinstall its disk subsystem
driver. I described how here:

https://www.theregister.com/2022/07/22/linux_nonapproved_laptop/

I got the info from the  _second_ answer here:

https://superuser.com/questions/1280141/switch-raid-to-ahci-without-reinstalling-windows-10

As it says there, also disable Bitlocker if it's enabled.

> As I understand it WIndows 11 needs TPM support.

Correct, although it can be worked around.

>  I believe that bios had this support before I installed Ubuntu 25 but it if so it is no longer available.  It is my understanding that it is not possible for a Linux installation to effect the bios so perhaps I have this wrong.

That should not be possible, no.


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