thanks to Tom he mentioned a working howto for installing the touch driver on Ubuntu 10.10.
I tried this guide after doing
sudo apt-get upgrade
and rebooting and touch works fine. I also tried the gesturetest application from the utouch framework
like described here https://wiki.ubuntu.com/Multitouch/Testing/UsingGesturetest and get nice looking Output.
But I don’t know, who I could use any multi touch/dual touch gesture with my Acer. Which applications supports it? Who has a hint?