My camera is not detected with GTKam(MDK9.2).
Is there any better program for Polaroid fun320?

check to see if its found in the kernel
if its a usb cam, try lsusb and see that it has been found,
then try lsmod to see if the module is running,
if not, you have to get the right module for it, it might be best to see if its supported in the kernel first, if not, then do a google for it.
and remember, google.com/linux is the one to use...

Have you tried updating your version of GTKam? There's bound to be more definitions added since the version bundled with Mdk9.2

Wow, that camera connects via serial port. I forgot pc's still had them. GTkam does list support for it, Your delema is serial ports need root permission.

This should work if you open a terminal window and
1) type "su" without quotation marks, and enter key
2) supply your root password and enter key
3)Type "gtkam" without quotation marks and hit enter key.

you now have gtkam running with root permissions, simply have your camera plugged in and powered on, select your camera model (Polaroid Fun! 320), and the first port, and hit detect button. You may have to do that changing the port # each time (there are seven listed to try) till you get the port assigned to your camera.

I believe after you figure out which serial port your camera connects to you can change the permissions so you can run gtkam as regular user by the following command as root:
chmod a+rw /dev/ttyS0
the last digit of command will be 0 - 7 depending on which port camera was discovered on.
*********I have no experience with changing permissions on devices, so if I am wrong somebody please speak up***********************
Better yet, hold off on the chmod command unless someone says it is good, in mean time always start gtkam as above (in terminal as super user)

In trying to learn a bit about these polaroid serial cameras, I came across the funniest review I have ever read off topic, but it made my morning, LMAO:
http://www.epinions.com/content_58970640004

Learned me some interestin stuff this morn, although I probably never will get a serial device, but that polaroid review made it all worth while.