How to Burn a ISO Filesystem on a USB Drive Using the Linux Command Line  
First type at the prompt
lsblk
Insert the USB disk, and type again
lsblk
From the previous two outputs, it will be clear what the name of your USB drive is. Let's say the name of your USB drive is /dev/sdf. Then, download an ISO image of a linux distro, and burn it on your USB drive as follows:
sudo dd bs=4M if=ubuntu-19.04-desktop-amd64.iso of=/dev/sdf conv=fdatasync
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