[ubuntu] creating a bootable disk..

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http://ubuntuforums.org – so ive been trying this with a vast array of linux OS's, including android... i currently have ubuntu 12.10, and love it, will never go back to windows bloatware again.. but ive been having some problems, i service computers in the area, and i would like to be able to install ubuntu or really any linux os (ubuntu prefferable) for my customers. problem is, anytime i try and create a boot disk (dvd/cd/usb) it doesnt extract correctly to the drive.. on usb, after trying to boot from usb that is, it tells me that there was no operating system found... furthermore, on cd/dvd, all that happ (Hardware)