genomics:~# apt-cache policy ; apt-cache policy libc6 initrd-tools
Package Files:
 100 /var/lib/dpkg/status
     release a=now
 500 http://security.debian.org stable/updates/contrib Packages
     release o=Debian,a=stable,l=Debian-Security,c=updates/contrib
     origin security.debian.org
 500 http://security.debian.org stable/updates/main Packages
     release o=Debian,a=stable,l=Debian-Security,c=updates/main
     origin security.debian.org
 500 http://mirror.switch.ch stable/main Packages
     release v=4.0r0,o=Debian,a=stable,l=Debian,c=main
     origin mirror.switch.ch
Pinned Packages:
libc6:
  Installed: 2.3.2.ds1-22sarge5
  Candidate: 2.3.6.ds1-13
  Version Table:
     2.3.6.ds1-13 0
        500 http://mirror.switch.ch stable/main Packages
 *** 2.3.2.ds1-22sarge5 0
        100 /var/lib/dpkg/status
initrd-tools:
  Installed: (none)
  Candidate: 0.1.84.2
  Version Table:
     0.1.84.2 0
        500 http://mirror.switch.ch stable/main Packages
     0.1.81.1 0
        100 /var/lib/dpkg/status