Here's a problem whose resolution requires knowledge of both Android and Ubuntu, but I'm asking it here first rather than in the Ubuntu forums. I have a smartphone (Motorola Moto E) running Android 5.1. I can view its files (on the SD card anyway) using Dolphin. I have encountered some directories that appear empty using ES File Explorer on the phone but have files within them when viewed with Dolphin. They happen to be music folders, though that's probably not relevant. I need to resolve this inconsistency and see (and access) the directory contents within Android. I suspect that there's some kind of file permission problem, perhaps relating to file ownership. But Dolphin doesn't seem able to display file ownership and permission, even for native Ubuntu files. And I don't see how to view that information via the Ubuntu command line (with ls -l or something similar). My phone isn't rooted.