I found this procedure on the webs and used it slightly modified, as outlined below.

Become root with sudo su -
Insert the USB drive, and find its device name.


sdk                 8:160  1  31.6G  0 disk
└─sdk1              8:161  1  13.7G  0 part /run/media/gill/OCTD

Unmount the partition.

umount /dev/sdk1

Run fdisk with the device name and remove existing partitions.

fdisk /dev/sdk

Create a primary partition, make it bootable, and set the type to 7 (HPFS/NTFS/ExFAT). Write the changes and exit fdisk.

Create a FAT32 filesystem.

mkfs.vfat -F 32 /dev/sdk1

Mount the partition to a directory

mount /dev/sdk1 /media/usb

Mount the ISO image to a directory

mount -t udf -o loop,ro,unhide windows10.iso /var/tmp/w10

Copy all the files from the ISO to the USB directory

cp -arv /var/tmp/w10/* /media/usb

Write out the buffers to the USB stick


Unmount the ISO and the USB

umount /media/usb
umount /var/tmp/w10

Remove the USB drive.