> So, does this mean that /var/lib/lists is configured during installation of
> Debian?
aptitude update writes the files in that directory. They are the
package lists downloaded from the repository. These simply contain
the list of packages available in that repository, along with other
metadata such as available version numbers, descriptions, etc. You
can open the files in any text editor to see their contents.
Using aptitude show <pkgname>, for example, picks up the metadata from
these files.
For your sources.list, aptitude has downloaded the package list from
ftp://ftp.nl.debian.org/debian/dists/etch/main/binary-i386/.
Just do another aptitude update. Aptitude will fix its
/var/lib/apt/lists and all will be well.