How to Create a Kali Bootable USB Drive from ubuntu.

1. insert your usb drive.
2. run the command below.
 it will show all drive

sudo fdisk -l

3. the output will look somthing like this, showing an additional device.

4. change directory where your iso file is located.

5. type in terminal

dd if=filename.iso of=/dev/sdb bs=512k

6. hit enter

after sometime you will see like this:

5823+1 records in
5823+1 records out
3053371392 bytes (3.1 GB) copied, 746.211 s, 4.1 MB/s

you have successfully made your kali bootable.