My webcam is not working on Ubuntu 12.04 LTS
lsusb gives
Bus 001 Device 003: ID 0c45:6270 Microdia PC Camera (SN9C201 + MI0360/MT9V011 or MI0360SOC/MT9V111) U-CAM PC Camera NE878, Whitcom WHC017, ...

Installed cheese, but not detected

In the gstreamer-properties also it is not detected

while issuing tail -f /var/log/syslog
Feb 9 20:32:13 sunil-desktop kernel: [ 9182.070820] gspca_main: sn9c20x-2.14.0 probing 0c45:6270
Feb 9 20:32:13 sunil-desktop mtp-probe: checking bus 1, device 4: "/sys/devices/pci0000:00/0000:00:1d.7/usb1/1-7"
Feb 9 20:32:13 sunil-desktop mtp-probe: bus: 1, device: 4 was not an MTP device

Feb 9 20:39:02 sunil-desktop CRON[9759]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete)

You need the camera driver. See for example, http://forums.linuxmint.com/viewtopic.php?f=47&t=17132

I find better luck with UVC webcams. UVC support is in the linux kernel and USB UVC webcams work automatically. See also http://www.ideasonboard.org/uvc/