GPG error

[Ahmed Altaher]

Dearest all

using FAI from Debian I got this error that occured during installation, how can I fix it

W: GPG error: http://archive.ubuntu.com maverick Release: The following signatures 
couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5


Ahmed
 		 	   		  
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