Try this page. The file to edit is
/etc/X11/xorg.conf. Be sure to have a backup of your original
xorg.conf before you modify it. This could save your life.
sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf-backup-20120517-touchscreen-not-working
Then edit the file accordingly to what is written in the above link.
Remember that editing
xorg.conf can lead to a broken X Windows System (no GUI) and thus is pretty dangerous if you're not fully comfortable with a bare command line.
If you should have troubles, you can always:
- try to remove
sudo rm /etc/X11/xorg.conf) and see if Xorg can start a decent X server without it
- issue a
sudo Xorg -configure (see Configuring X11). It should create a
xorg.conf.new in your
/root directory. Then try to copy it to its original location with
sudo cp /root/xorg.conf.new /etc/X11/xorg.conf
- read a bit more about X configuration and expecially about display resolution configuration (and in your specific case also about input device configuration) and try to build yourself your first working
EDIT: sorry didn't see the previous comments. Also found a guy that probably did it:
The touch screen is a NextWindow Voltron 23.6" touchscreen. It works great in windows and with a little configuring I can get it to work in Ubuntu. To get it working in Ubuntu I need to install the evtouch driver for X and then add a few lines to the X config.