Can't redeem Humble Bundle purchases in Software Center

[TenLeftFingers]

After I click the "Buy" button, I see 2 operations eternally in progress. 1 is: "querying software sources" and 2 is "Installing [X]" but the throbber oscillates from left to right and back again - never processing.

I tried an apt-get update and the output was sketchy. See attached.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: software-center 5.2.6
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic-pae 3.2.30
Uname: Linux 3.2.0-32-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu13
Architecture: i386
Date: Wed Oct 17 19:02:53 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120328)
PackageArchitecture: all
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)

[TenLeftFingers (tenleftfingers)]

Solved the problem by issuing this command:

$ sudo -i
# apt-get clean
# cd /var/lib/apt
# mv lists lists.old
# mkdir -p lists/partial
# apt-get clean
# apt-get update

Source: http://askubuntu.com/questions/1877/what-is-the-easiest-way-to-resolve-apt-get-badsig-gpg-errors

This still needs to be integrated in some way so that the user does not need to do their own plumbing.