[ubuntu] Recover data from previous partition?

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http://ubuntuforums.org – So I installed jaunty overtop an old jaunty install on an older computer just to have a basic computer for a friend of mine to use. Well it turns out there was important information that I need to retrieve from the previous install, yet I do not have any of the proper tools required to get at such data. Couldn't find anything about it in the forums but if it is there and I overlooked it, please feel free to direct me to the proper post. (Hardware)