# chroot /var/chroot/sid dpkg --force-depends --install /var/cache/apt/archives/libc6_2.13-8_i386.deb
(Reading database ... 349 files and directories currently installed.)
Unpacking libc6 (from .../archives/libc6_2.13-8_i386.deb) ...

A copy of the C library was found in an unexpected directory:
  '/lib/i386-linux-gnu/libc-2.13.so'
It is not safe to upgrade the C library in this situation;
please remove that copy of the C library or get it out of
'/lib/i386-linux-gnu' and try again.

dpkg: error processing /var/cache/apt/archives/libc6_2.13-8_i386.deb (--install):
 subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/libc6_2.13-8_i386.deb