This guide is based on the Ubuntu Wiki - Multitouch documentation and various community forum posts.

This guide is intended as a relatively easy step by step mostly graphical (GUI) guide to:

• Calibrate a touchscreen panel or monitor on Ubuntu 11.04 or later.

Requirements:

• Ubuntu 11.04 or later installed machine.
• Touchscreen panel or monitor. In this case a LG Flatron T1710 Monitor.

1. Install uTouch - Ubuntu Multitouch framework.

• uTouch is installed by default in Ubuntu 11.04, if not installed on your system add it from the Software Center or with the following command.
• Open the Terminal Window and enter :

sudo apt-get install utouch

2. Install xinput calibrator.

• xinput calibrator is a easy GUI Touchscreen Calibration program for X.Org. Install it from the Ubuntu Software Center or using the command below.
• Open the Terminal Window and enter :

sudo apt-get install xinput-calibrator

3. Use xinput calibrator to determine the x and y co-ordinates of your touchscreen.

• Now we use xinput calibrator  to measure the xMin, xMax, yMin and yMax values of the touchscreen.
• Launch xinput calibrator (Called Calibrate Touchscreen in the ubuntu program menus)
• Use a stylus to tap the four registration point indicated in red on screen by the program.

4. Note the results from xinput calibrator.

• Make a note of the calibration data supplied by xinput calibrator, but ignore the instruction supplied regarding making the calibration permanent.

5. Update X11 evdev configuration.

• Once you have determined the x and y co-ordinate information, you need to add it to the X11 configuration files, for the evdev driver, the default installed driver used for handling Touchscreen input events.
• The X11 configuration for the Touchscreen can be found in the ​/usr/share/X11/xorg.conf.d/10-evdev.conf file.
• Edit the file, find the Touchscreen InputClass and add: Option "Calibration"  "xMin xMax yMin yMax" 
• Replace the xMin, xMax, yMin and  yMax values with your values obtained in step 4. 
• Open the Terminal Window and enter :

sudo gedit /usr/share/X11/xorg.conf.d/10-evdev.conf

• Then add calibration option settings obtained in Step 5 to the touchscreen InputClass section: 

Option "Calibration" "96 3914 155 3899"

​

6. Logout to Restart X11.

• Finally to enable your calibartion settings log out and back in again to restart X11.