Re: sero7 pro
Ubuntu 12.04's implementation of MTP is broken. I was never able to get the later MTP versions to work on 12.04, so I used an FTP server on the phone/tablet and connected to it from the desktop over wifi.
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.