I'm trying to dual boot Ubuntu with Windows 10 (Legacy BIOS), but whenever I try and install, I get this:

dual boot

Is there a solution from here? Can I just press the option not to force UEFI, and carry on with installation?

I followed this guide exactly, but the "Force UEFI installation?" occurs at the "Preparing to install Ubuntu" stage.

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    If the machine is UEFI capable why on Earth have you installed Windows in Legacy? Now, if you need a proper dual boot you need to boot the Ubuntu installer in the same way, i.e., not UEFI. How it boots is how it installs. – user589808 Oct 4 '16 at 17:29
  • I upgraded from an old version of Windows, which I guess was installed in Legacy. I tried to boot it in non UEFI, but that takes me straight back to the Windows loading screen. Any ideas how to boot it in the same way? – Drummermean Oct 4 '16 at 17:35
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    Windows should boot the same exact way if you disable UEFI (= CSM or Legacy only). That way the USB should boot in legacy. Otherwise there will be two entry for the some drive; choose the one without UEFI. If it doesn't boot that way it means it was probably done with Rufus or similar tool that forces one mode or another. ubuntu.com/download/desktop/create-a-usb-stick-on-windows (notice the "partition scheme"; you need the option pictured - MBR - for booting in non-UEFI systems). – user589808 Oct 4 '16 at 18:35
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    Thanks, I'm now another stage further in dual booting. I believe the wrong selection was made before when creating the USB stick. I used Rufus and changed the partition scheme to MBR and it has now worked. Thank you! – Drummermean Oct 4 '16 at 20:21

I ran into a similar issue when attempting to dual boot Ubuntu 18.04 on a machine running Windows 10 with legacy BIOS. This process might help:


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