apt-get bails with this error...

[Mark Wagnon <mwagnon1@home.com>]

Hi all,

I was installing upgrading one of my machines to potato, and
apt-get did what I thought was its business, but it seemed too
short of a period of time for it to finish. I did an apt-get
upgrade (assuming I was officially at the potato level) and
apt-get gives me this:

   E: Size mismatch for package fdflush

I re-installed fdflush by hand, but that didn't work. Any ideas?
Should I try to install a package from another mirror?

tia
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Mark Wagnon             Debian GNU/ -o) / /  (_)__  __ ____ 
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Chula Vista, CA                     /\\/ /__/ / _ \/ // /\ \/ /   
mwagnon1@home.com                  _\_v____/_/_//_/\_,_/ /_/\_\
                                           http://www.debian.org