[bitfolk] apt-get Question...

Maybe someone who knows more about apt-get than me can help... I'm starting to install what I need into my new VPS (after following Robert's very useful setup guide - thanks!) and added a backports repository to the list. When I do an 'apt-get update', it tells me that it has problems with a key: W: GPG error: http://www.backports.org lenny-backports Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EA8E8B2116BA136C And then says that 'You may want to run apt-get update to correct these problems,' which seems a trifle circular, to say the least. A search show several suggested fixes for this, but the ones I've tried (apt-key update) didn't have any effect. The ones I don't understand at all, I haven't tried :-) Any suggestions gratefully received! julian -- Templeman Consulting Limited IT Consulting and Training