An excellent alternative to Ubuntu installation disk is a USB as a memory device (flash drive), an external hard drive or even memory cards such as SD, MMC, Memory Stick, etc.
This tutorial is the most complete and well explained, it works for Ubuntu 7.10, 8.4 and 8.10 as well as Xubuntu, Edubuntu and Kubuntu as there are some but not well documented and with clear instructions, and that more is on the increase install Linux from USB memory because no wasted CD's or DVD's or many computers today have no floppy drive, CD / DVD as the popular Asus Eee, the Macbook Air and the Acer One.
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