First of all make sure the eGalax touch controller is detected by your Linux system. Go to linux command shell and execute below command:

lsusb

This command will list all the USB devices that are attached to the Linux system. If the list shows a line with D-WAV eGalax, you can proceed with the driver installation.

Visit below site and copy the driver file URL. The driver file extension will be tar.gz.

https://www.eeti.com/drivers_Linux.html

Execute the below commands at the command shell:

wget https://www.eeti.com/touch_driver/Linux/20201110/eGTouch_v2.5.9321.L-x.tar.gz
tar -xzf eGTouch_v2.5.9321.L-x.tar.gz
cd eGTouch_v2.5.9321.L-x
sh setup.sh

Follow the on-screen instructions and finish the installation. After reboot the touchscreen should work.