apt - How do I install packages to an 8.10 system?

I am trying to copy some files from a disused Ubuntu 8.10 system.

To do that I need to install nfs, portmap, etc., since those are not already installed.

So I open Synaptic to install the packages. It figures the dependencies and lists the needed packages. I click 'Apply' and get a warning that the sources cannot be authenticated. I click 'Apply' anyway and get an error message like:

W: Failed to fetch
http://us.archive.ubuntu.com/ubuntu/main/pool/p/portmap/portmap_6.0-6ubuntu1_i386.deb
404 Not Found [IP: 91.189.92.167 80]

Where is there a repository for the most recent 8.10 packages?

---

Thanks for your detailed answer.

I used vi instead of sed, and just replaced each occurrence of 'us.archive' with 'old-releases' using: :g/us.archive/s//old-releases/g

I believe that that is equivalent although my sed skills are a little rusty.

First I simply replaced the 'archives' without getting rid of 'us.' and got the same 404 errors as before, so that part is important.

It seems to be working so far!

I did get some errors like:

Failed to fetch http://security.ubuntu.com/ubuntu/dists/intrepid-security/main/binary-i386/Packages.gz 404 Not Found [IP: 91.189.92.166 80]

when I clicked 'Reload' in Synaptic. Should I do something about that?