Gphoto2 is a command line tool for digital cameras in linux. Main Page: http://www.gphoto.org/There are some guis based on gphoto2. Like Digikam, Gtkkam. You can apt-get them with synaptic.
Some hints about using gphoto2:
Viewing digital camera's abilities:
Listing folders:Code:gphoto2 -a
Downloading all files in camera:Code:gphoto2 -l
Upload a file to cam (We must specify an upload folder in camera)Code:gphoto2 -P
Additional help, type:Code:gphoto2 -u a.jpg --folder /store_00010001/