Create a bootable USB from an ISO using dd on the Linux command line

Install syslinux, a suite of utilities which ensures the iso image is in SYSLINUX format rather than ISOLINUX

    $ sudo apt-get install syslinux

Convert the iso image to SYSLINUX format

    $ isohybrid /path/image.iso 

Locate the USB device 

    $ lsblk

    sdb         8:16   1   3.8G  0 disk 

    └─sdb1      8:17   1   3.8G  0 part /media/user/usb_disk

Unmount the USB device

    $ sudo umount /dev/sdb1

Ensure it is indeed unmounted

    $ lsblk

    sdb         8:16   1   3.8G  0 disk 

    └─sdb1      8:17   1   3.8G  0 part 

Copy the ISO image onto the USB deisk

    $ sudo dd if=/path/image.iso of=/dev/sdb1