That’s odd. It should still be picked up as a generic PTP device IIRC. Make certain that your camera is in the right mode for PTP connectivity.
What happens if you just try to issue
gphoto2 --list-files
If you really get stuck, you should be able to obtain help from here:
http://gphoto-software.10949.n7.nabble.com/
gphoto2 mailinglists:
http://www.gphoto.org/mailinglists/