the most simply way is :
dd if=image.iso of=/dev/sdX
sdX is your usbkey (often sdb or sdc... check with fdisk -l)
be aware : if you write /dev/sda, you will probably override all your harddisk (I don't think this what you want...)
=> when you want to use linux, you need to learn the command line... it's like driving a car without a licence ! it's not that hard, don't worry...
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