I've been messing around all day trying do dual-boot Ubuntu 15.04 64-bit on my Dell XPS 12-9Q33 running Windows 10. I'm running into roadblocks everywhere however, so I thought I'd see if anyone with knowledge about these sorts of things had any advice for me!

Anyway, here are the steps I've taken so far:

  • Shrunk my Windows partition

  • Created a bootable USB with Ubuntu 15.04 64bit using the Universal USB Installer.

  • Disabled hibernation entirely, presumably disabling Fast Boot.

  • Disabled Secure Boot

  • Tried with 2 different USB sticks, in both USB ports

No matter what I try, I just can't get my computer to recognize that there is a bootable USB available! This is in UEFI mode, of course - switching to legacy mode immediately lets the computer recognize the bootable USB, but will presumably create problems with the bootloader.

The only two boot options available in the setup/BIOS are 'Windows [something or other, I forget exactly]' and 'UEFI OS'. Selecting either of those options boots to Windows.

So, any ideas? Thanks so much for your time!


  • /UEFI, /legacy, Ubuntu supports legacy even better than UEFI, it has both UEFI and BIOS mode, UEFI and BIOS bootloaders. – Star OS Oct 11 '15 at 11:43
  • It sounds almost like you didn't make an EFI bootable USB. What are you using to make the USB sticks? – TheWanderer Oct 11 '15 at 12:36
  • Many UEFI systems require a separate setting to allow USB (or any other device) boot. See if you have that setting somewhere. Often best to have secure boot off, but UEFI on, and CSM/BIOS/Legacy mode off. – oldfred Oct 11 '15 at 14:42

Your Ubuntu installation media seems to be improperly configured regarding the bootability.

When you have an already existing Ubuntu installation - recreate your installation media by:

  1. Open built-in Disks tool – click the menu (right top corner) - select Restore Disk Image.
  2. Choose the Ubuntu iso image - select the USB drive to write it to and start the process.

In case you have to do it from within Windows - open command prompt as administrator.

  1. Create your Ubuntu USB installation media by executing the following commands:

    list disk  
    select disk ¹  
    create partition primary  
    format fs=fat32 quick  
    assign letter=²  
  2. Mount the Ubuntu iso file and copy the content to the USB drive.

¹ = select the USB drive
² = choose a free drive letter

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  • Thank you! It appears that Universal USB Installer does NOT create a UEFI compatible bootable image. Using 'rufus' instead worked perfectly. – user3379936 Oct 12 '15 at 12:28

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