yes, and here is the output


Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.DhD6e2Q3Xb --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv-keys E084DAB9
gpg: requesting key E084DAB9 from hkp server keyserver.ubuntu.com
gpg: key E084DAB9: public key "Michael Rutter <marutter@gmail.com>" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)



________________________________
 From: Emre Sahin <i.emre.sahin@gmail.com>

Cc: "r-help@stat.math.ethz.ch" <r-help@stat.math.ethz.ch> 
Sent: Wednesday, May 15, 2013 5:35 PM
Subject: Re: [R] R update problem


On Wed, May 15, 2013 at 07:59:32AM -0700, carol white wrote:
> Hi,
> I try to update R on Ubuntu
> 
> I added deb http://cran.cnr.Berkeley.edu/bin/linux/ubuntu precise/ in /etc/apt/sources.list but any mirror site that I take, I get the following error msg:
> 
> W: GPG error: http://cran.cnr.Berkeley.edu precise/ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9
> 

Hi, 

In a terminal, could you type

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E084DAB9

HTH. 

E. 
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