I followed whatever is suggested at http://ubuntuforums.org/showthread.php?t=654153.
I had followed the commands that are given there. Recounting them here..
aptitude install qc-usb-sources
sudo m-a prepare
sudo m-a build qc-usb
dpkg -i qc-usb-modules-[your_version].deb
Now, firing up gqcam fails. In XTerm, it was exiting with message, device file not found. In /dev, the file that corresponds to the cam is /dev/video0. I did a ln -s video0 video and now gqcam show a vague resemblence if what lies in front of its eye.
Wow! never expected I’ll get this cam working on this beige machine. Remember, the cam is no less than seven years old. It worked OK under Windows. But after quitting Windows, I had almost given up hopes on getting this cam work.
Now, gotta learn how to use this cam under Pidgin or such applications..
here is what ‘lsusb’ says about this cam: “Bus 002 Device 002: ID 046d:0850 Logitech, Inc. QuickCam Web”