I am using Windows 10, recently I want to move Ubuntu 18.04, and for some reason I can't completely uninstall Windows 10 now, So I want to use Ubuntu 18.04 along with Windows 10. But the problem is: When I run the Ubuntu Installation, it does not show Install Ubuntu alongside Windows. Which is expected by me, as previously I've used Ubuntu [ From 15.10 to 17.10 ] with Windows 7. So I don't try Something Else option to install Ubuntu, because I am in fear if I won't access Windows 10 from GRUB.

Anyway, currently Windows 10 is installed in Legacy BIOS mode & I think Ubuntu want UEFI.

So, can anyone tell me, is it possible to install Ubuntu in Legacy Mode? If yes than how?

  • I’m not sure, but your problem may be related to this (Ubuntu installer doesn’t see Windows): askubuntu.com/q/1032170/630335
    – Steve
    Commented May 5, 2018 at 5:21
  • 1
    Just to double check, can you confirm your disk is set as AHCI in the BIOS?
    – Steve
    Commented May 5, 2018 at 5:23
  • Did you find a solution? Commented Aug 26, 2019 at 5:20

1 Answer 1


Yes! I had the same problem and solved it by using Universal USB Installer that uses legacy mode.

I found out about Universal USB Installer and the fact that it writes to the USB in legacy mode from this recent post on It'zGeek in a section under Step 2, describing how to "Create a bootable USB disk" with Windows.

When I booted from this image, then the legacy Windows 10 installation was recognized and I was able to install Ubuntu 18.04. The only condition is that Universal USB installer is a Windows program, so I had to use Windows to make the legacy mode Ubuntu 18.04 live USB, which is not a big deal.

  • thanks for your response. After install, did you find any option to boot Windows 10 in GRUB Bootloader?
    – Shimul
    Commented May 10, 2018 at 4:57
  • Yes, the option is there and it works.
    – John Flood
    Commented May 10, 2018 at 5:20
  • OK, I will try. let's see what will be the output.
    – Shimul
    Commented May 10, 2018 at 8:50

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