I'm wondering if the USB is working on windows, if you are running it as dual boot.
I assume the camera has a USB connection. I suspect that you need to make sure that USB is actually working, which is why I suggested "redetect".
When you first fire up the computer, you are met with a scrollable menu of several items.
4. Windows (if it is dual boot)
5. other OSs (if detected)
Once it is up and running, and you are logged in and you are presented with a desktop, does it see the camera as "mass storage"? i.e. like a USB memory plug drive? If it does not, then the problem would be there rather than in the DigiKam
automatically mount anything it sees as an USB drive. Open the file cabinet icon in the panel (taskbar) and it should be shown there.
In my case, it is called DIGITALCAMERAUSB(D)
and a right click shows it is located in /home/richard/.D
Try opening it to see if the camera's directory structure and file system can be read in the file manager (which is Konqueror, btw)
Apart from that, no suggestions, except you could try plugging in a memory plug into a USB port and see if that is recognised.
And as a last resort, in case there is a problem with the particular USB port on the computer, have you tried plugging into other USB ports on the machine?
Older machines with USB ports only on the back are a pain to access, but a trick I use on a couple of those is to have standard USB male to USB female extension cables plugged in, and the mating end of them lie on the floor beside the front of the PC tower
There are also hardware and software specific forums at www.linspire.com
and you might like to go and see if your problem is mentioned, once we know that the computer and the OS are detecting USB correctly.