CLI: Bootable USB From ISO

Check if flash drive is properly plugged and identify its label (something like /dev/sda):

sudo fdisk -l

Run dd command to make a bootable USB from the ISO file:

sudo dd bs=4M if=/path/to/file.iso of=/dev/sdX status=progress oflag=sync

Replace /path/to/file.iso with the path to your ISO file and replace /dev/sdX with the name of your device.