I get the following error when running synaptic:
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W: GPG error: http://www.debian-multimedia.org wheezy Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY 07DC563D1F41B907
W: GPG error: http://ppa.quickbuild.pearsoncomputing.net squeeze Release: The 
following signatures were invalid: BADSIG 43F1DC4F2B8638D0 QuickBuild Trinity 
Desktop Environment
----------------------

what's the best way of fixing it?

cheers

ant
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