I have a brand new iPod Touch (32 GB). I have done nothing to it except to log in and attach it to my home wireless network.
I can attach it to my Ubuntu machines and (after sorting out an issue with a shorted cable) nothing comes of it.
On my iPod classic I had to convert it initially to a WinPod (rather than a MacPod), but I believe that is no longer necessary. Also on that device I turned on the so-called Disk-Mode which I also believe is no longer necessary.
Nonetheless, I cannot make this device mount and become folder-accessible so that I can fill it with flac music goodness.