apt-get gives MD5Sum mismatch

[Sebastian Canagaratna <s-canagaratna@onu.edu>]

Hi:

  I am trying to update my unstable on one of my linux machines and it
  gives 

  Failes to fetch
  http://http.us.debian.org/debian/dists/unstable/main/binary-i386/Packages.gz
  MD5Sum mismatch

  same for Packages.gz in non-free/binary-i386
  W: Could'nt stat source package list http: //http.us.debian.org
  unstable/main Packages
  (/var/lib/apt/lists/http.us.debian.org_debian_dists_unstable_main_binary-i386_Packages)
  -stat (2 No such file or directory)
  and another similar message. Now I have another linux machine and that
  has the same sources.list file and seems to have no problem.

  How does one  get around this difficulty?

  Thanks.

  Sebastian Canagaratna
  Department of Chemistry
  Ohio Northern University
  Ada, OH 45810