W: GPG error: http://ppa.quickbuild.pearsoncomputing.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 099723A280479E11
Which key do I need? The Trinity key didn't do any good.
You would need the key from Slavek's PPA on this page: https://quickbuild.pearsoncomputing.net/~slavek-banko/+archive/axis
Expand the technical details section to see the fingerprint, and click on the "What's This" link next to it to get instructions on installation.
Thanks!