apt works well, except...

[Osvaldo La Rosa <olr@audiobraille.org>]

Hi, I have a strange problem and no one Deb devel had found any answer.
Here it is:
when I do apt-get update or apt-get dist-upgrade: it works; but now, If
I do: dselect update I see this error message and it prompts then again
to the prompt:

mount: No medium found

update available list script returned error exist status 1.

Press enter to continue.


I am not too advanced enough to imagine any solution. Do you?

Thnx in advance;
Debgreetings,

Osvaldo - a blind Deb user.