X11 font problem

Hi I have this problem and do not know how to solve it, I'm new to R

R version 2.15.0 (2012-03-30)

That is a very old version of R: the posting guide asked you to update 
before posting.

Copyright (C) 2012 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: x86_64-unknown-linux-gnu (64-bit)

Which is not very specific.  The posting guide asks for sesssionInfo(): 
on a current version of R that would tell which Linux distro.

x11 font -adobe-helvetica-%s-%s-*-*-%d-*-*-*-*-*-*-*, face 1 at size 16 could not be loaded 		 	   		

You read the manual, the current version of which is at 
http://cran.r-project.org/doc/manuals/r-release/R-admin.html#Useful-libraries-and-programs 
, starting 'For the best font experience with these devices you need 
suitable fonts installed '.

You should also check

capabilities('cairo')

if that is false (as I suspect), read the parts about cairo support and 
reinstall R with cairo support.

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and provide commented, minimal, self-contained, reproducible code.

PLEASE do.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK