I have the solution for this, but since it is problem that has occurred on two versions of Ubuntu I thought I'd share it.
Sometimes my integrated webcam is not functioning, I try to load cheese or skype and they tell me that no device is available.
dmesg and get:
dmesg | grep video [ 0.326451] pci 0000:01:00.0: Boot video device [ 20.999208] [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work. [ 21.608294] Linux video capture interface: v2.00 [ 21.610059] uvcvideo: Found UVC 1.00 device Laptop Integrated Webcam (05a9:2640) [ 21.612608] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround. [ 21.612692] uvcvideo: Failed to query (129) UVC probe control : -32 (exp. 26). [ 21.612696] uvcvideo: Failed to initialize the device (-5). [ 21.613004] usbcore: registered new interface driver uvcvideo