Problem with plot in several cases, font issue?

Dear all,

I am having problem on plots in R for some cases.
Your machine has Cairo: Cairo-based X11 devices do not use those fonts. 
  So it seems you have done something you have not shown us.

The fix is to use the Cairo-based X11 devices.  See the R-admin manual 
for more details.
For example:

plot( 1:10 )
text( 1:10, letters[1:10], cex = 1)
works well but :

plot(1:10)
text(1:10, letters[1:10], cex = 0.9)
returns :
Erreur dans text.default(1:10, letters[1:10], cex = 0.9) :
   impossible de charger la police X11
-adobe-helvetica-%s-%s-*-*-%d-*-*-*-*-*-*-*, de face 1 et de taille 11

(sorry for the french).
But it is very easy to set LANGUAGE=en to get American English messages ....
In this message, for other cases the function may changed (it can be
axis( ) for example) but it always a font problem.

I encountered this issue various times (with more complicated graphics).

I'm working on ubuntu 12.04 with R 3.0.1 (2013-05-16).

The capabilities function returns me:
   jpeg      png     tiff    tcltk      X11     aqua http/ftp sockets
TRUE     TRUE     TRUE     TRUE     TRUE    FALSE     TRUE     TRUE
  libxml     fifo   cledit    iconv      NLS  profmem    cairo
  TRUE     TRUE     TRUE     TRUE     TRUE    FALSE     TRUE

I think this may be an issue with my installation, but I could not
figured out what was the missing package.
I tried this on other computers. I did not see the same bug.

Thanks in advance for the help,

Alice

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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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Problem with plot in several cases, font issue?

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