R library unwrittable

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http://stackoverflow.com – I want to update the core packages of R on ubuntu 12.04. But every time R says that it has no permissions to write to the library. Other packages with do not come with the r-core installation through the terminal. sudo apt-get install r-base are installed in my personal library. I gave myself the owner permissions of every library folder and this does not work. So am i able to make this library writtable and if so, how can i do it? Or is there a way to Run R as administrator/root. I already tried a lot of options from the internet but could not find what i was looking for. Many thanks in a (HowTos)