sources.list help v.2

[Dave Stevens <geek@uniserve.com>]

I have a friend with a new debian amd-64 install. He has unrar-free but it 
won't open RAR 3.0 files. It looks like it would be worthwhile to try unrar 
but I am not able to get appropriate access for synaptic.

I went to:
http://packages.debian.org/sid/unrar/amd64/download

and tried adding a line to /etc/apt/sources.list as suggested at that page but 
get error warnings when starting synaptic. The error text is:

W: Couldn't stat source package list
http://http.us.debian.org sarge/main Packages
(/var/lib/apt/lists/http.us.debian.org_debian_dists_sarge_main_binary-amd64_Packages)
- stat (2 No such file or directory)
W: Couldn't stat source package list
http://http.us.debian.org sarge/non-free Packages
(/var/lib/apt/lists/http.us.debian.org_debian_dists_sarge_non-free_binary-amd64_Packages)
- stat (2 No such file or directory)
W: Couldn't stat source package list
http://http.us.debian.org sarge/contrib Packages
(/var/lib/apt/lists/http.us.debian.org_debian_dists_sarge_contrib_binary-amd64_Packages)
- stat (2 No such file or directory)

the current sources.list file is:

deb cdrom:[Debian GNU/Linux 4.0 r1 _Etch_ - Official
amd64 DVD Binary-1 20070819 -12:16]/ etch contrib main

deb cdrom:[Debian GNU/Linux 4.0 r1 _Etch_ - Official
amd64 DVD Binary-1 20070819 -12:16]/ etch contrib main

deb http://debian.yorku.ca/debian/ etch main
deb-src http://debian.yorku.ca/debian/ etch main

deb http://security.debian.org/ etch/updates main
contrib
deb-src http://security.debian.org/ etch/updates main
contrib
deb http://http.us.debian.org/debian/ sarge main
non-free contrib

The net effect is that searching 
for unrar gives only the already installed unrar-free. I have the .deb 
package for unrar but installing it fails due to a dependency error.

Can someone point me to a tutorial or explain how to get better information 
about the problem? This is what I got from uname:

roger@debianroger:~$ uname -a
Linux debianroger 2.6.18-5-amd64 #1 SMP Tue Oct 2 20:37:02 UTC 2007 x86_64 
GNU/Linux

Thanks very much.

Dave

-- 
Alexis Soyer, that Napoleon of the kitchen, to celebrate the ending of the 
Crimea war, served up a dish which he called a Culinary Emblem of Peace, 
containing among many other ingredients twelve boxes of lobsters and 200 
eggs.

- H.W. Tilman