[other] md5sum donot match

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http://ubuntuforums.org – I have tried to download lubuntu 12.04 alternate version twice. At first i downloaded using torrent but the md5sum did not match. then i tried direct downloading using Internet Download Manager but even this time the md5sum did not match. Would anybody tell me what should i do ? The exact version that i want to download is lubuntu-12.04-alternate-i386.iso :(:( (Hardware)