I use ubuntu 13.04, my sansa clip zip mp3 player ( uses usb) does not mount. I am new to ubuntu so i'm not sure how to proceed whe it says" unable to open device'[usb:001,011]' ?
According to this community entry you just need to go to "settings > system > usb mode" and select "MSC". Just do this in my player and it now visible in ubuntu.
Looks like MTP live in parallel to MSC so don't be confused when you will not see any files copied from Windows machine.
Version of firmware on my player is 1.1.20. There is a chance that you should update firmware to find usb option