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W: GPG error: http://www.lamaresh.net squeeze Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 905C75258D4B24D2
I have tried to Edit the Source by going to Update Manager, selecting Edit - Other - Best Server but although choosing in turn all the servers suggested, during the Reload sequence the error message is generated again.
Curiously, sometimes when clicking on Close in the error box, the upload proceeds normally but increasingly this is not so.
Any suggestions on how to cure this problem would be gratefully received.