Problems with the Package System

[Simon Schwarz]

Hi,

I have problems with the Package System.

I need to install the kernel source because of the NVIDIA drivers. 

After selecting the needed package and click on update the window with
"blalabla need CD-ROM number 3" appears but the right CD is in the
drive. This window comes as often I click on OK.

Is this error known? Any suggestions?

Thanks!
Simon

P.S: My mother language is german. Please forgive me some errors ;)