Bug#31833: apt does not upgrade

[Francesco Potorti` <F.Potorti@cnuce.cnr.it>]

Package: apt
Version: 0.1.9
Severity: normal

I have libc6 installed:

$ dpkg --list libc6
Desired=Unknown/Install/Remove/Purge
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name            Version        Description
+++-===============-==============-============================================
ii  libc6           2.0.7v-1       The GNU C library version 2 (run-time files)

and dselect reports that a new version is available:
 *** Req base     libc6        2.0.7v-1    2.0.7-19981 GNU Libc: shared libraries

Other updated packages are also available, but dselect won't download
them:

Updating package status cache...done
Checking system integrity...ok
The following packages will be REMOVED:
  unzip-crypt libglib1.1 libcapplet0 ssltelnet libgtop-daemon libssl08
  libc6-doc cfs zip-crypt
  libgtop1 bzip grub libpanel-applet0 liborbit0
The following NEW packages will be installed:
  zip glibc-doc unzip
The following packages have been kept back
  netscape3 rvplayer
0 packages upgraded, 3 newly installed, 14 to remove and 2 not upgraded.
Need to get 1569k of archives. After unpacking 19.0k will be freed.
Do you want to continue? [Y/n]

Here are all the updated packages available reported by dselect:
    --- Updated packages (newer version is available) ---
    ----- Updated Required packages -----
    ------- Updated Required packages in section base -------
 *** Req base     libc6        2.0.7v-1    2.0.7-19981 GNU Libc: shared lib
 *** Req base     timezones    2.0.7v-1    2.0.7-19981 GNU Libc: Timezone d
    ----- Updated Standard packages -----
    ------- Updated Standard packages in section admin -------
 *** Std admin    locales      2.0.7v-1    2.0.7-19981 GNU Libc: National L
    ------- Updated Standard packages in section devel -------
 *** Std devel    libc6-dev    2.0.7v-1    2.0.7-19981 GNU Libc: Development

-- System Information
Debian Release: 2.1
Kernel Version: Linux pot 2.0.34 #42 Wed Sep 23 08:44:47 CEST 1998 i586 unknown

Versions of the packages apt depends on:
ii  libc6           2.0.7v-1       The GNU C library version 2 (run-time files)
ii  libstdc++2.9    2.91.60-2      The GNU stdc++ library (egcs version)

--- Begin /etc/apt/sources.list (modified conffile)
deb ftp://sunsite.doc.ic.ac.uk/Mirrors/ftp.debian.org/pub/debian potato main contrib non-free
deb ftp://sunsite.doc.ic.ac.uk/Mirrors/non-us.debian.org/pub/debian-non-US potato/binary-$(ARCH)/

--- End /etc/apt/sources.list