Paul wrote:
snip all

Okay, with the Ubuntu version 16.04 the 'Startup Disk Creator' will not
do the Windows ISO. However the following DOES WORK. I just tested it.

To OP follow these steps

1) Go to MS website and download Windows ISO

2) Get a usb key 6 GB or greater. I used a 32GB Sandisk. Insert it.

3) Open a terminal window CTRL+ALT+T and enter one-liner to install WoeUSB:

sudo add-apt-repository ppa:nilarimogard/webupd8 && sudo apt update &&
sudo apt install woeusb

4) You have to discover the device for the USB KEY and you must unmount
it because it auto-mounted via fuse when you stuck it into your USB slot.

cat /etc/mtab

On mine the line started:
/dev/sdb1 /media/jonathan/VOLUME_IDENTIFIER ...

Two things to note the device path without the partition number, in this
case '/dev/sdb' and the mountpoint '/media/jonathan/VOLUME_IDENTIFIER'

5) Unmount the key but leave it in the slot. No sudo needed it's mounted
in userspace.

umount /media/jonathan/VOLUME_IDENTIFIER

6) Now run the woeusb command specifying ISO and filesytem parameters. I
am should full paths in my example for clarity:

sudo woeusb --target-filesystem NTFS --device
/home/jonathan/Downloads/Win10_1809Oct_English_x64.iso /dev/sdb

Booted into Windows setup just fine. Does create two partitions on key
with the probematic UEFI partition that frustrates other methods. Here
is my mtab for the formatted key:

/dev/sdb2 /media/jonathan/UEFI_NTFS vfat
rw,nosuid,nodev,relatime,uid=1000,gid=1000,fmask=0 022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remou nt-ro
0 0

/dev/sdb1 /media/jonathan/Windows\040USB fuseblk
rw,nosuid,nodev,relatime,user_id=0,group_id=0,defa ult_permissions,allow_other,blksize=4096
0 0


--
Take care,

Jonathan
-------------------
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http://www.LittleWorksStudio.com