Internal Error with APT

[Manuel Saelices <Manuel.Saelices@isotrol.com>]

Hello, I'd like to upgrade to a Woody (I have a Potato). When I run the 
following command (after running apt-cdrom):
   apt-get -f dist-upgrade
It respondes as follows:
   .......
   Media Change: Please insert the disc labeled .... and press enter 
<enter>

   E: Internal Error, Couldn't configure a pre-pend
   #~_

Can anybody help me?
Thanks for reading.... Bye.



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