Just follow following procedure,
>> isohybrid lxle-12045-32.iso
it returns following warnings:
isohybrid: Warning: more than 1024 cylinders: 1279
isohybrid: Not all BIOSes will be able to boot this device
Then wrote the usb key with:
sudo dd if=lxle-12045-32.iso of=/dev/sdb bs=4M
Done