Even I am facing the same problem with my "HP Pavillion DV6000 laptop".
Previously I configured the webcam with same link as given by novatillasku.
But after updating to "Ubuntu11.04" from 10.10 . The webcam seems to not working.
It gives the following error msg on recompiling the http://code.google.com/p/r5u870/
$ uname -a
$ Linux explorer 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686 i386 GNU/Linux
On further investigation I found that in 38 kernel, videodev.h has been removed/changed .
make -C /lib/modules/2.6.38-8-generic/build M=/home/niks/Downloads/r5u870 V=0 modules
make: Entering directory `/usr/src/linux-headers-2.6.38-8-generic'
CC [M] /home/niks/Downloads/r5u870/r5u870.o
In file included from /home/niks/Downloads/r5u870/r5u870.c:59:0:
/home/niks/Downloads/r5u870/usbcam/usbcam.h:38:28: fatal error: linux/videodev.h: No such file or directory
make: *** [/home/niks/Downloads/r5u870/r5u870.o] Error 1
make: *** [_module_/home/niks/Downloads/r5u870] Error 2
make: Leaving directory `/usr/src/linux-headers-2.6.38-8-generic'
make: *** [all] Error 2
I checked with webcam softwares such as "gucview" also..But they are also not able to start/open webcam.
Please help us with this.!!
Bangalore , India