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I just downloaded the 64-bit Windows 10 ISO, and trying to create a pendrive installer (since my computer doesn't have an optical drive). The system I have available is Ubuntu 14.04, which is the same machine I'm trying to install Windows 10 to.

I tried every method listed in an Ask Ubuntu question, however the result is consistent: the drive is formatted properly, all files including the bootx64.efi file are correctly located, but it is not possible to boot to the USB stick.

When I restart the computer, press F8 during POST to select where to boot and pick the USB, the screen just flashes and goes back to the normal GRUB screen.


Context: I have a dual boot of Win7 + Ubuntu installed to different HDDs. The USB stick is a generic, 8GB USB 2.0.

Specs: AMD FX-6300, ASUS M5A97, 8GB RAM, a 500GB HDD (Win7) and a 1TB HDD (2 partitions, 300GB Ubuntu, 700 generic/shared with Windows)

  • Since you have Win 7, why not create the installer from Rufus? – Martheen Cahya Paulo Jul 31 '15 at 2:39
  • @MartheenCahyaPaulo The Windows 7 install has been corrupted by Windows Update, and stuck on a reboot loop. Wouldn't bother with Win10 if not for that. :P – Kroltan Jul 31 '15 at 3:11
  • FYI in that case Win10 can't automatically activate with free upgrade scheme. You might better off repairing the Win 7 and upgrade from there. – Martheen Cahya Paulo Jul 31 '15 at 3:21
  • @MartheenCahyaPaulo I know, but the Windows 7 install is FUBAR, would require a reinstall, and I don't have the CD anymore. I plan on installing the trial, then buying a key. Downloading W7 is out: considering the quality of my connection, the time cost invloved would surpass the cost of buying Windows 10. – Kroltan Jul 31 '15 at 3:38
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You can install Windows 10 from Ubuntu without even making a bootable USB. If you have the Windows 10 Setup ISO, extract all its contents to a separate partition, and then add a grub boot entry to boot from there.

First, Mount the ISO

sudo mount -o loop [ISO_Path] [Mount_Point]

Copy its content to any other partition. Remember don't extract it into a Folder, just put all in the root of the drive(like D:\ or E:). Windows can not see ext3/4 filesystem, so put it either in a NTFS or Fat16/32 partition.

Now add a new menuentry in /boot/grub/grub.cfg

menuentry 'Windows 10' {
set root=(hdX,Y)
insmod part_msdos
insmod ntfs
insmod ntldr
drivemap -s (hd0) ${root}
ntldr /bootmgr
}

Here (hdX,Y) is the source where you have extracted the ISO image. Now restart your computer and select Windows 10 from boot menu to continue installation.

Watch This On Youtube -> https://www.youtube.com/watch?v=1Y4JXv9r5Ug

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