I'm not sure if that's a problem as it is finding the amd64 package list.
It's not finding the i386 package file as there is none.
On my machine
i added the deb to /etc/apt/sources.list
matthew-S206:/home/matthew % uname -m
After an apt-get update it got the package files.
matthew-S206:/home/matthew % grep amazon /etc/apt/sources.list
deb http://ec2-79-125-53-176.eu-west-1.compute.amazonaws.com/apt/ precise contrib
I can then search for the packages.
matthew-S206:/home/matthew % ls -l /var/lib/apt/lists/*amazon*
-rw-r--r-- 1 root root 2301 Mar 12 23:28 /var/lib/apt/lists/ec2-79-125-53-176.eu-west-1.compute.amazonaws.com_apt_dists_precise_contrib_binary-amd64_Packages
-rw-r--r-- 1 root root 952 Mar 12 23:28 /var/lib/apt/lists/ec2-79-125-53-176.eu-west-1.compute.amazonaws.com_apt_dists_precise_Release
I should then be able to install them (but i have no real idea what they are ).
matthew-S206:/home/matthew % apt-cache search co3509
co3509ns2 - ns-2 packaged for using on CO3509 at UCLan
co3509nsbench - nsBench 1.3 from http://www.mnlab.cs.depaul.edu/projects/nsbench/
co3509nstrparsers - Parsers for ns-2 trace files which give throughput, jitter, delay and packet loss measurements.
co3509stats - Stats packages for network data. Including: stddev, CI, jains and NRU.
You may be missing keys to anthenticate the repo.
matthew-S206:/home/matthew % sudo apt-get install co3509ns2
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 85.1 MB of archives.
After this operation, 0 B of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
Install these packages without verification [y/N]? n
E: Some packages could not be authenticated
Can you tell me the name of the package you are trying to install ?
I think the question is how to remove search for the i386 packages ?