I'd install and activate programm Mathematica 8 on my ubuntu (10.04, Gnome 2.30.2).
But when i treid to run it, i get message about registration like this:

The bug is, that I CAN'T press any button. And then i close the window programm cloasd too.
I treid press enter, space, double click... it does not work at all!
What is it? What can i do? Does any body know something about this trange thing?