Ubuntu – How to fix “doesn’t look like an EFI partition” with WinUSB

bootdual-bootgrub2mount

Using WinUSB I get this error. I would appreciate any help as I'm trying to put Windows back on computer to please th' wifey, then dual boot so i can still use Ubuntu.

Installation failed !
Exit code: 512
Log:
Formating device...
Mounting...
mount: block device /home/lighthouse/Downloads/Windows 8.1 Update 1 Pro X64 PreActivated/Windows 8.1 Update 1 Pro X64 PreActivated.iso is write-protected, mounting read-only
Copying...
Installing grub...
Installing for x86_64-efi platform.
grub-install: error: /media/winusb_target_1412439366_7311 doesn't look like an EFI partition.
.
Error occured !
Syncing...
/usr/bin/winusb: line 78: 15592 Terminated              while true; do
    sleep 0.05; echo 'pulse';
done
Cleaning...
/usr/bin/winusb: line 78: 15971 Terminated              while true; do
    sleep 0.05; echo 'pulse';
done
Umounting and removing '/media/winusb_iso_1412439366_7311'...
Umounting and removing '/media/winusb_target_1412439366_7311'...

Best Answer

  • If what you want is to create a bootable usb to install Windows 8, you must use the dd command in Ubuntu:

    Open a terminal.

    Run it:

    dd if=/path/to/file.iso of=/dev/sdb
    

    Note: Carefully check that the usb-stick is /dev/sdb