For Linux Distributions, it is highly recommended that you use 'dd' to write to your USB drive since it will be preinstalled on your system. Use the command listed below with the appropriate file extension and drive names without the parenthesis.

sudo dd if=[name of Tails Image File] of=/dev/[Name of your USB drive] bs=16M oflag=direct status=progress

You now have a live USB of Tails OS. From here you can insert the drive into a different computer and use it, or you can reboot your current computer and boot from your USB drive.