updating ubuntu

[aerospace1028 at hotmail.com]

Okay,
I found some instructions on how to update ubuntu packages (i.e. orca) without an internet connection.  One of the steps doesn't seem to work.
 
I went to http://packages.ubuntu.com/) and went through the contents and downloaded orca and all it's dependencies (and ependencies of dependencys, and dependencies of dependencies of dependencies, ad infinitum), and the same for firefox-3 (advice from orca mailing lists says it works better than firefox-2).
 
I moved all this into a folder on a usb drive called debs.  I went back to my ubuntu computer and added the following line to my /etc/apt/sources.list file:
 
deb file:/media/disk debs/
 
The directions I found indicated that for apt to understand what is in there I need to run the following command
 
>>sudo dpkg-scanpackages /media/disk/debs /dev/null | gzip >/media/disk/debs/Packages.gz
 
But dpkg-scanpackages appears to be an invalid command.  I looked under dpkg --help but could not find a simullar function.  Does anyone know what the replacement for dpkg-scanpackages is?  Or what i need to do so apt-get can navigate the deb files on the usb?
 
--Thank you
 
 
 
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