error when updating

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Author: betty
Date:  
To: plug-discuss
Subject: error when updating
whenever i try to update (ubuntu 10.04 lts) i get this message :

GPG error: http://ppa.launchpad.net lucid Release: The following
signatures couldn't be verified because the public key is not available:
NO_PUBKEY 5A9BF3BB4E5E17B5Failed to fetch
http://www.openprinting.org/download/printdriver/debian/dists/lsb3.2/main/binary-amd64/Packages.gz
503 Service Temporarily Unavailable
Some index files failed to download, they have been ignored, or old ones
used instead.

and my network printer intermittently stops working as well.
are these two problems related, and should i attempt to fix the first
one, if so, how do i do that?
thanks

ps, using chrome, really like it.

--
betty i.
www.webcanine.com
information for people
who care for dogs.

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