Re: Ubuntu 10.04 doesn't recognise Canon Legria HF R306
That camera was first released in 2012 as far as I can tell, and your distro was released in 2010; that may well be your problem.
Try using a live CD of Ubuntu 12.04 or better yet, 12.10 and see if it works as expected. If it does, then you need to use a newer version of Ubuntu.
EDIT: Your lateral thinking was a good solution too. I'm glad you can access the files now with little fuss.
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.