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

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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