Bug#325533: libc6: can't upgrade

[LI Daobing <lidaobing@gmail.com>]

Package: libc6
Version: 2.3.2.ds1-18
Severity: important

can't upgrade libc6, it sounds conflict with base-files.
my base-files version is: 3.1.0.0.1.pure64

$ sudo aptitude install libc6
Reading Package Lists... Done
Building Dependency Tree
Reading extended state information
Initializing package states... Done
Reading task descriptions... Done
The following packages have been kept back:
  [snip]
The following packages will be upgraded:
  libc6
1 packages upgraded, 0 newly installed, 0 to remove and 424 not upgraded.
Need to get 0B/4318kB of archives. After unpacking 4096B will be freed.
Do you want to continue? [Y/n/?]
Writing extended state information... Done
(Reading database ... 43197 files and directories currently installed.)
Preparing to replace libc6 2.3.2.ds1-18 (using
.../libc6_2.3.2.ds1-22_amd64.deb) ...
Unpacking replacement libc6 ...
dpkg: error processing
/var/cache/apt/archives/libc6_2.3.2.ds1-22_amd64.deb (--unpack):
 trying to overwrite `/usr/lib64', which is also in package base-files
Errors were encountered while processing:
 /var/cache/apt/archives/libc6_2.3.2.ds1-22_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Ack!  Something bad happened while installing packages.  Trying to recover:
dpkg: dependency problems prevent configuration of libc6-dev:
 libc6-dev depends on libc6 (= 2.3.2.ds1-22); however:
  Version of libc6 on system is 2.3.2.ds1-18.
dpkg: error processing libc6-dev (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of locales:
 locales depends on glibc-2.3.2.ds1-22; however:
  Package glibc-2.3.2.ds1-22 is not installed.
dpkg: error processing locales (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 libc6-dev
 locales
Reading Package Lists... Done
Building Dependency Tree
Reading extended state information
Initializing package states... Done
Reading task descriptions... Done

-- System Information:
Debian Release: 3.1
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.11-9-amd64-k8
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)

Versions of packages libc6 depends on:
ii  libdb1-compat                 2.1.3-7    The Berkeley database routines [gl

-- no debconf information
-- 
LI Daobing