i found some answers
1) Install build-essential and the kernel-headers for your kernel (linux-headers-2.6.17-6-686 for me).
2) Download latest driver from
http://www.saillard.org/linux/pwc/ (
http://www.saillard.org/linux/pwc/files … c1.tar.bz2 for me)
3) Unpack and go into extracted directory
4) make
5) modprobe -r pwc
6) sudo cp pwc.ko /lib/modules/2.6.17-6-686/kernel/drivers/media/video/pwc/pwc.ko.saillard
7) cd /lib/modules/2.6.17-6-686/kernel/drivers/media/video/pwc
sudo mv pwc.ko pwc.ko.ubuntu
9) sudo ln -s pwc.ko.saillard pwc.ko
10) sudo depmod -a
11) modprobe pwc
12) Enjoy! smile