[ubuntu] Unable to change folder permissions

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http://ubuntuforums.org – I am using a Ubuntu 10.04 Live USB. Its running on a 8gb flash drive. My system also has a 1tb hard drive which I want to share over the network. I managed to share the default Documents folder which is in the USB drive. But I am unable to share any folder on the 1tb drive. I am not able to change the permission settings on the folder properties. Kindly advice me. I search around but could not find a solution. (Hardware)