For me it's still not working

When I reconnect it after system has come up, dmesg says:

Code:
[ 1612.802827]usbcore registered new interface driver TouchKit
but it does not change anything.

I also tried to copy the tkusb.ko to /lib/modules/2.6.27.7/kernel/drivers/usb/input/ as you mentioned, but the directory didn't exist. did you have to create that? I created it and copied it there. Didn't help. I also tried to copy it to
/lib/modules/2.6.27.7/kernel/drivers/usb/
/lib/modules/2.6.27.7/kernel/drivers/usb/misc
/lib/modules/2.6.27.7/kernel/drivers/input/
/lib/modules/2.6.27.7/kernel/drivers/input/misc
/lib/modules/2.6.27.7/kernel/drivers/input/touchscreen
/lib/modules/2.6.27.7/kernel/drivers/input/mouse
(which did already exists).
Also didn't help.

But I think its not a problem of finding or loading the module, because

/proc/bus/usb/devices already says "Driver=TouchKit". dmesg does so as well. And lsmod shows, that the module is loaded.
/dev/tkpanel0 does exist, but if I do a

cat /dev/tkpanel0 and touch on the screen nothing happens.

I think some garbage should appert on the console, shouldn't it?

when I run TouchKit, the gui comes up and says found Touchcontroller at /dev/tkpanel0 and all buttons, 4 points calibraten etc. are available, but when I touch the screen there is still no reaction, so that I cannot calibrate or use it.

I think there is still something reading the data from the device or something, but I have absolutely no idea what it coult be, or how I could find that out.

What exact version of ubuntu, xorg and touchkit driver do you use?