server:~# apt-get -f install
Reading Package Lists... Done
Building Dependency Tree... Done
Correcting dependencies... Done
The following extra packages will be installed:
  libc6 perl perl-base
Suggested packages:
  glibc-doc libterm-readline-gnu-perl libterm-readline-perl-perl
Recommended packages:
  perl-doc
The following packages will be upgraded:
  libc6 perl perl-base
3 upgraded, 0 newly installed, 0 to remove and 202 not upgraded.
7 not fully installed or removed.
Need to get 9057kB of archives.
After unpacking 2454kB disk space will be freed.
Do you want to continue? [Y/n] y
Get:1 ftp://ftp.de.debian.org unstable/main libc6 2.3.6-15 [4731kB]
Get:2 ftp://ftp.de.debian.org unstable/main perl-base 5.8.8-6 [760kB]
Get:3 ftp://ftp.de.debian.org unstable/main perl 5.8.8-6 [3566kB]
Fetched 9057kB in 1m41s (89.0kB/s)
(Reading database ... 19795 files and directories currently installed.)
Preparing to replace libc6 2.3.2.ds1-22sarge3 (using .../libc6_2.3.6-15_i386.deb) ...

Name Service Switch update in the C Library: pre-installation question.

Running services and programs that are using NSS need to be restarted,
otherwise they might not be able to do lookup or authentication any more.
The installation process is able to restart some services (such as ssh or
telnetd), but other programs cannot be restarted automatically.  One such
program that needs manual stopping and restart after the glibc upgrade by
yourself is xdm - because automatic restart might disconnect your active
X11 sessions.

Known packages that need to be stopped before the glibc upgrade are:
        xdm kdm gdm postgresql xscreensaver

This script did not detect any installed services which need to be
stopped.

If you want to interrupt the upgrade now and continue later, please
answer No to the question below.

Do you want to upgrade glibc now? [Y/n] y

WARNING: This version of glibc requires that you be running
kernel version 2.4.1 or later. Earlier kernels contained
bugs that may render the system unusable if a modern version
of glibc is installed.
dpkg: error processing /var/cache/apt/archives/libc6_2.3.6-15_i386.deb (--unpack):
 subprocess pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/libc6_2.3.6-15_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)