Create Bootable USB from ISO File
dmesg after plugging in your USB thumb drive to find the device name (/dev/sdb).
# umount /media/username/devicename # dd bs=4M if=/path/to/filename.iso of=/dev/sdb
Note, do not output to a partition (e.g. /dev/sdb1). In the past this has created a loop device instead of copying the input file to the USB thumb drive.