R help - May 2013 - R update problem

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


What is the solution?

Thanks

Carol

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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.