[ubuntu] sharing folder and content between users on same computer

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http://ubuntuforums.org – I am a new user of Ubuntu 11.10 and over the past couple of weeks have been researching and trying to set up and share a folder with other users on the same computer. I have tried setting up a shared folder, setting user groups but each user I set up is able to access all of my folders and files not just a single folder and file content. I want to be able to share one single folder with movies with my users. I am a new user and am looking for a step by step process on how to set this up. Thank you in advance for any assistance. (Hardware)