Help finding hidden folders on GS3 using ubuntu

My screen is completely out on my old Galaxy SIII and I have several folders that are hidden on its internal storage using a '.' at the beginning of the folder's name. I made a bootable usb drive with ubuntu on it (I natively run Windows 8), but I knew that only ubuntu or the like would let me find folders that are hidden this way.
However, despite booting up ubuntu, and connecting the phone to the computer, I cannot find the folders. Any help?
I'm not able to see anything on the GS3 screen, btw.

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