Important Security Update Error

[Keith]

On Sun, 26 Jul 2009 16:03:16 -0500, you wrote:

>I have been out of town for a while, and, when I returned, I had a lot
>of system updates waiting for me.  When I tried to install the updates,
>one of them (labeled as an "Important Security Update" got the following
>error message:
>
>W: Failed to fetch
>http://security.ubuntu.com/ubuntu/pool/main/t/tiff/libtiff4_3.8.2-11ubuntu0.9.04.1_i386.deb
>  404 Not Found
>
>Is this something that I should worry about?  Unfortunately, the Update
>Manager keeps coming back to try to install this failed update.  Can I
>stop this from happening?
>
>Thanks,
>John

Open a terminal and type 

sudo apt-get update && sudo apt-get upgrade

on the command line. See if that fixes the missing package.