I had almost exactly the same problem some months ago that was solved thanks to this thread.
I have a large OSX partition on my MacBook (C2D) where I store my music folders and files. On the rest of the HDD, I have various partitions for a number of Linux OSes.
To enable me to play music in Ubuntu Hardy, I disabled journaling in OSX, and then changed the permissions on the My Music folder to Read&Write for me, group and everyone.
So, back into Ubuntu and, after mounting the OSX disk, I tried to open the music files. But, unlike before (in Gutsy) where I had no problem, now although I could open the Users/paul/Music folders, I could go no further.
This turned out to be because the underlying folders and files were owned by root (and yes, I could open and play any music file as root -- but that's not what I want).
So, as root, I changed the ownership of the /Users/paul/Music/My Music folder to me and then it opened fine. While doing this I clicked the "Apply Permissions to enclosed files" button.
However, the enclosed folders and files STILL retained root as the owner.
Now, obviously, I could go through each folder and file to change it's ownership to me but that would be quite a task.
Strangely, in Forecast Linux, which I also have on the MacBook (and this distro is quite Ubuntu-ish) without doing anything extra after making the permission changes in OSX, I have ready access to all of the very same music files.
I hope somebody can suggest where I might be messing up here.
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