Nikon DSL 3100 camera
 

Shotwell cannot unlock for download of pictures.ls an external
Card reader the best option and do they all work.
Ubuntu 14.04

I use Digicam for my Nikon D40. Digicam will work for both an internal card reader and a USB cable to my camera.

I used to use shotwell. As I remember it shotwell worked for cards but it would not work with a USB cable attached to a Canon model that I owned. I don't remember the model number of the Canon camera which did not work.

--------------------------
Steve Stites

Usually the issue I've had is the camera gets recognised (and mounted) prior to shotwell getting the chance. Simply umount it and try again.
I use cheap multi-card readers to load my D7000 without issue - although it's been a while since I used shotwell.

Thanks for suggestions I will give the cheap card reader a try.As very new it seems way to go.