apt-cache policy libc6
libc6:
  Installed: 2.3.2.ds1-22sarge3
  Candidate: 2.3.2.ds1-22sarge3
  Version Table:
 *** 2.3.2.ds1-22sarge3 0
        500 cdrom://[Debian GNU/Linux 3.1 r2 _Sarge_ - Official i386 Binary-1 (20060419)] unstable/main Packages
        100 /var/lib/dpkg/status