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I recall that I have been able to easily build a dual boot Windows-Ubuntu system by:

  1. Installing windows-10
  2. Booting Ubuntu from USB and installing alongside existing windows.

The second step includes resizing the Windows partition and creating a new partition for Ubuntu.

If the goal is to be able to dual boot Windows-10 and Windows-11, is it possible to follow said procedure and somehow command Ubuntu to install Windows-11 from a .iso alongside the windows-10 install? or Install Ubuntu and then somehow overwrite the Ubuntu with Windows-11?

I suspect this idea is not new, but have no idea what it is called to Google it. Ideally there would be a procedure published on the internet?

gatorback
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  • Ubuntu provides many ISOs that use different installers, but the Ubuntu installers are intended to be used for installing the Ubuntu system they come with. I QA test systems & Ubuntu offers as boot options whatever OSes it can read (file-systems in use, including if clean and not just type of fs impact results) which can include most non-Ubuntu systems, but the dual boot procedure is usually controlled by whatever OS is last installed (I usually let it install & fix it post-install; but we don't support Windows 11). Dual boot means multiple OSes, not just two (the dual boot here has 3) – guiverc Oct 05 '23 at 00:43
  • Have you tried How can I install Windows after I've installed Ubuntu?? Did it not work or are you just trying to find an alternative method of installing Windows after you've installed Ubuntu? – karel Oct 05 '23 at 10:44
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    @karel Given an existing Windows 10 on a 2 TB NVME (20% full), the goal is to reside Windows 10 and create a new 500GB Partition for Windows 11. Maybe the second partition can be carved out by Ubuntu? – gatorback Oct 11 '23 at 03:13

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