I've got a new handheld device Sony Ericsson Xperia ST25i with Android operating system recently. This device has internal storage only, it has no external storage. I tried to connect it in my Ubuntu 12.04 but my file manager (Dolphin) could only read and could not write into its storage. And you know, Sony PC Companion program (tool for transferring files into Xperia) is not available for Linux until today. So, I try Ubuntu 15.04 today. You may do it from LiveCD. Out of the box, Ubuntu detects my Xperia easily and I can read or write any files (create folder, copy MP3, copy images, etc.) into my Xperia. You don't need to install anything. By using this, you don't need Sony PC Companion again. I want to share it here.