I was a bit hasty on my first post, I apologize. You're getting a
BADSIG error. I am unfamiliar with fixing that, however a search
revealed this page:
http://askubuntu.com/questions/1877/what-is-the-easiest-way-to-resolve-apt-get-badsig-gpg-errors

It seems to have some solutions. For example:

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

Good luck,
Jeff


On Tue, Jul 10, 2012 at 2:08 PM, ant <aw30@...> wrote:
> On Wed, 11 Jul 2012, Jeffry Johnston wrote:
>> sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1F41B907
>
> Thank you! Now I get:
> -------------------
> GPG error: http://ppa.quickbuild.pearsoncomputing.net squeeze Release: The
> following signatures were invalid: BADSIG 43F1DC4F2B8638D0 QuickBuild Trinity
> Desktop Environment
> Failed to fetch
> bzip2:/var/lib/apt/lists/partial/ppa.quickbuild.pearsoncomputing.net_slavek-banko_axis_ubuntu_dists_squeeze_main_source_Sources
> Hash Sum mismatch
> Failed to fetch
> bzip2:/var/lib/apt/lists/partial/ppa.quickbuild.pearsoncomputing.net_slavek-banko_axis_ubuntu_dists_squeeze_main_binary-amd64_Packages
> Hash Sum mismatch
> -------------------
>
> which I didn't before. Could this be a coincidence?
>
> cheers
>
> ant
>
> --
> Sent from my linux system running Debian 6, desktop trinity-KDE.
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