Thank you very much for the answer. I will wait for the version beta 2. After, I will send the results of the installation.
Answering your question: "Did you try the CD and DVD in the same computer and in the same DVD drive?" Yes. I did the installations in the same computer, using the same DVD drive. Actually, I used 2 DVD drives, but in both I tried to install using CD and DVD. Do you know when the Lenny beta 2 will be released? Thanks again, Gilberto