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when I attempt to boot from my USB stick, it try's to begin the install process, but throws an "uncompression error - system halted"

could this have anything to do with having encrypted my entire disk when I installed 13.04? if so, how do i go about decrypting it to prepare for the 12.04 install?

(going back because battery life is worse, laptop runs A LOT hotter, and there are not any noticeable differences (at least for me))

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