Now the Ubuntu 8.04 Hardy Heron is out, however installing this version on my tc4400, Alice, was not a good idea :-)
The tablet didn't work at all.
Trying to make my tablet alive, I decided, to install an earlier version.
So second time, I installed Ubuntu 7.04 Feisty Fawn.
The tablet works fine, but I've got some other problems, which I will try to solve.