This utility allows you to:
-- Automatically detect and configure a wide range of wacom products
-- Set custom key commands or mouse buttons to a tablet's shortcut buttons
-- Set custom pressure curve on each of the tablet's input devices
-- Automatically remembers and reapplies settings on startup
-- At present, serial and bluetooth tablets are not yet supported.
HOW TO USE PRESSURE SUPPORT IN GIMP:
1. Open GIMP
2. In the Edit menu, click on preferences
3. Click on Input Devices
4. Click on Configure Extended Input Devices
5. For the devices; stylus, eraser and cursor, set the Mode to ‘Screen'
6. Click Save, then Ok and you're done!
Install Wacom Control Panel in ubuntu 10.04
First you need to download .deb package from here you can install this deb package by double clicking on it