Create USB bootable from ISO in Ubuntu 16.04

UNetbootin should work: http://unetbootin.sourceforge.net/

Or you could try a bit-by-bit copy:

1. Insert the USB device and then open Disk Utility (in 10.10 and older, System -> Administration -> Disk Utility).
2. Select the USB device from the list in the left of the program and detect where it was mounted: /dev/sd[1 letter][optionally 1 number]. For example, /dev/sdc or /dev/sdc1.
3. Make sure the USB device is unmounted (not safely removed, but unmounted) If it is mounted you can unmount it:

   sudo umount /dev/sd[1 letter][optionally 1 number]
   

4. Assuming the .iso file is in your home folder, open the terminal and write:

   sudo dd bs=4M if=[ur .iso] of=/dev/sd[that 1 letter]
   

   Example:

   sudo dd bs=4M if=windows7.iso of=/dev/sdc
   

And wait for it to finish. (The "bs=4M" - bit is optional, just makes it faster.)