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Ok, thanks, Meho_r & Thorsten.
I updated my Ubuntu to the newest version and reinstalled the full texlive (2009) and lyx (2.0) again. Even I created a new user in order to avoid old configuration files.
Everyting worked all right.

Thanks.

In windows I use MikTeX.

OK Meho_r, thanks a lot.

I did everything you said, but it didn't work anyway. I had suposed that it had no relation with the files, because biblatex had worked with this and other files in my windows machines (WXP & W7), but not in my Ubuntu one.

In Ubuntu I have not biber installed, and I was ...

To show in the toc, have a look on this:
http://avizit.blogspot.com/2005/11/addi ... latex.html

Ok, there you are.

Thanks

I'm try to use biblatex in lyx.
Everything goes right when I use it on Windows.
But I have a problem when I try to compile just the same file on an Ubuntu os.
Of course I changed the path in the \bibliography command, but it doesn't work anyway.
I've successfully try to export the file to .tex and ...