How to create a Local Repository with a Pen Drive?

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http://askubuntu.com – I want to install Ubuntu 12.04 in many systems simultaneously and the Internet Speeds are way too slow!. So i thought of using my pen drive as a Local Repository, by copying all the Updated packages from one system and install it to the other systems for a faster update. I used this link and tried to solve my problem - How to make USB drive as local repository, but still its not as good as installing Ubuntu using the Internet because i got some errors and its not a detailed explanation. Can anyone please give me a detailed and an easily understandable way of creating a Local Repository with m (HowTos)