hello am getting this error message whilst trying to update a new install
A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://extras.ubuntu.com maverick Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY
and then a number which may be specific to me I dont know. how do I find and make this public key available
Amd 64 maverick 10.10 alternate Acer laptop.