[armel] upgrade libc6

[deb <theedge456@free.fr>]

hello,

je cherche à mettre à jour mon système armel/unstable et je vois les msg 
suivants:
...
Do you want to continue [Y/n]?
Reading package fields... Done
Reading package status... Done
Retrieving bug reports... Done
Parsing Found/Fixed information... Done
Setting up libc6 (2.11.2-2) ...
Checking for services that may need to be restarted...
Checking init scripts...

Restarting services possibly affected by the upgrade:
  wu-ftpd: restarting...done.
  exim4: restarting...done.
  cron: restarting...done.
  atd: restarting...done.

Services restarted successfully.
telinit: Can't open u
dpkg: error processing libc6 (--configure):
 subprocess installed post-installation script returned error exit 
status 127
Errors were encountered while processing:
 libc6
E: Sub-process /usr/bin/dpkg returned an error code (1)

comment puis-je résoudre ce pb ?