Cannot transfer digital photos from HP Photosmart Camera

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http://askubuntu.com – I connected the camera via USB and it was promptly recognized by Ubuntu and Shotwell, however when attempting to import photos, Shotwell can only find a single photo among hundreds. When accessing the camera via Nautilus, I can see the folders and all photos there but they are all greyed, not accessible and I am unable to find a way to transfer them. I've been here and my camera is not present, however some others quite similar are listed. Also I've been at HP support and the drivers for download are available for Windows and Mac only. I do know that I can transfer the photos on Windows using (HowTos)