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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