Digital camera importr no longer works

[Mike]

I am no longer able to import photos from my digital camera (Nikon 
Coolpix 2100).

I am using Ubuntu version 8.04. I have used this version in the past to 
import photos from my camera with no problem. Normally I store them in a 
folder called Pictures and file an arange them with F-Spot.

The error I get is:
    Error connecting to camera
    Received error "Could not lock the device"
    while connecting to camera

I have tried connecting this camera to an Acer Aspire One running UNR 
9.04 and it works fine.

Can some help me?

Thanks - Mike