Can't install software as not in the repo

[captnbli]

Binary package hint: software-center

Tried to install a couple of packages that failed. One was Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/universe/s/synapse/synapse_0.2.4.1-0ubuntu1_amd64.deb 404 Not Found [IP: 91.189.88.45 80]. This version is indeed not at that location. Not the only example as I say. On the Beta of 11.04

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: software-center 3.1.25
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
NonfreeKernelModules: wl
Architecture: amd64
Date: Thu Apr 7 19:30:13 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: Upgraded to natty on 2011-04-03 (3 days ago)