R is one of the coolest language designed and I am having lot of fun using it. It has become my preferred language of programming next only to Python. If you are also using Ubuntu, the rate of update of R in Ubuntu’s official repositories is slightly slow. If you want to get the latest packages as soon as possible, then the best option is to add some CRAN mirror to your Ubuntu repository. This by itself is straightforward. I decided to write this post on how to solve the GPG error if you get it.
(1) Decide on which CRAN repository you want to use. Finding the nearest one usually gives the best speed. Lets say it is http://cran.cnr.berkeley.edu/ . Append "bin/linux/ubuntu". Typically this works. You can confirm this by going to this url in the browser too.
(2) Add this to your Ubuntu repository. There are multiple ways. In the steps, below, replace http://cran.cnr.berkeley.edu/bin/linux/ubuntu with your mirror
(a) Synaptic -> Settings -> Repositories -> Other Software -> Add . In the apt line enter "deb http://cran.cnr.berkeley.edu/bin/linux/ubuntu natty/".
(b) sudo vim /etc/apt/sources.list and add "deb http://cran.cnr.berkeley.edu/bin/linux/ubuntu natty/" at the end. If you are not comfortable with vim, use gedit but instead of sudo , used gksudo.
(c)sudo add-apt-repository deb http://cran.cnr.berkeley.edu/bin/linux/ubuntu natty/
(3) Refresh the source repository by using refresh in Synaptic or using "sudo apt-get update "
(4) Install R or any other package you want. If you are installing R , I suggest you install r-base-dev instead of r-base. If you are installing some R package , check if it exists with the name r-cran-* . Else, install it using install.packages command inside R.
Fixing GPG Errors
When I did these steps, I got an error like the following (This occurred when I updated last month, this might be fixed now !):
GPG error: http://cran.cnr.berkeley.edu natty/ Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9
If you get the error, enter the following commands in the terminal.
gpg –keyserver keyserver.ubuntu.com –recv-key E084DAB9
gpg -a –export E084DAB9 | sudo apt-key add –
Repeat the steps above and this should fix the key error.