Initial install: Could not download all repository indexes

[gtrub00]

My initial installation is for 10.4 (desktop). I've configured the package manager with my proxy information under the network tab. Downloads are attempted but none are successful. example error:

Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/lucid/main/binary-i386/Packages.gz 400 Bad Request


I can download the example above via the firefox browser on the same machine configured with the same proxy.

I've reviewed other posts on this subject, but no helps. I've tried changing servers, other hacks, but no change in results. I suspect its a proxy issue, but I don't see how. I did provide the credentials in the http authentication window that my reverse proxy requires.

when I try to change servers, I get this message: No suitable download server was found

[gtrub00]

gtrub00@ubuntu:~$ cat /etc/apt/sources.list
# deb cdrom:[Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.1)]/ lucid main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://us.archive.ubuntu.com/ubuntu/ lucid main restricted multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid main

## Major bug fix updates produced after the final release of the
## distribution.

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ lucid universe
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu lucid partner
# deb-src http://archive.canonical.com/ubuntu lucid partner

deb http://us.archive.ubuntu.com/ubuntu/ lucid-security main restricted multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-security main
deb http://us.archive.ubuntu.com/ubuntu/ lucid-security universe
deb http://us.archive.ubuntu.com/ubuntu/ lucid-updates main universe restricted multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-security universe
gtrub00@ubuntu:~$

[gtrub00]

Well, it turned out to be my proxy settings after all. The synaptic package manager requires the actual proxy name and port...not an automatic configuration script url that contains that information in it like you can enter in the network proxy preferences